Draft California 2026 Integrated Report (303(d) List/305(b) Report)

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 158445, Aluminum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122604

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 158445, Aluminum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122603

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 2 of 14 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 158445, Aluminum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

25373

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 38 aluminum samples collected from the Upper Mainstem Eel River exceed the objective. Sample concentrations range from 4.29 to 1,737.00 ug/L. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The Maximum Contaminant Level for aluminum is 1.0 mg/l (1,000 ug/L).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Upper Mainstem Eel River at 3 locations as follows: (1) downstream of Van Arsdale Reservoir (SWAMP Station ID 111EELVAN), (2) near Hearst (SWAMP Station ID 111EELHST), and (3) above Dos Rios (SWAMP Station ID 111EELMAN). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

At the Van Arsdale site, samples were collected from February 2002 to April 2005. At the Hearst site, samples were collected from February 2002 to June 2002. At the Dos Rios site, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 158445, Aluminum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117916

Pollutant:

Aluminum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	155299	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
TMDL Name:	Eel River, Upper Mainstem Sediment and Temperature TMDLs
TMDL Project Code:	602
Date TMDL Approved by USEPA:	12/29/2004
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the Section 303(d) List under Section 4.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. Sixty-three lines of evidence are available in the administrative record. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. (3) The "Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek, and Lake Pillsbury) TMDLs for Temperature and Sediment" has confirmed temperatures in the Upper Main HA (including Tomki Creek) do not reflect natural conditions. (4) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. This listing applies to the entire waterbody. For BAECHTEL CREEK (LOEs 317841, 317845, 317849), 2 of 18 samples exceed the cold freshwater habitat beneficial use objective. For BEAR CREEK (LOEs 101029, 317872), 0 of 2 samples exceed the cold freshwater habitat beneficial use objective. For BERRY CREEK (LOEs 317883, 317888, 317893, 317897), 34 of 41 samples exceed the cold freshwater habitat beneficial use objective. For BLUE SLIDES CREEK (LOEs 101018, 101030, 317918), 0 of 10 samples exceed the cold freshwater habitat beneficial use objective. For BUCKNELL CREEK (LOEs 101099, 133579), 0 of 4 samples exceed the cold freshwater habitat beneficial use objective. For COLD CREEK (LOE 101031), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For COPPER BUTTE CREEK (LOE 317962), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For CORBIN CREEK (LOEs 101032, 317971), 0 of 7 samples exceed the cold freshwater habitat beneficial use objective. For DAVIS CREEK (LOEs 317977, 317982, 317987, 317992, 317996, 318000), 46 of 87 samples exceed the cold freshwater habitat beneficial use objective. For EEL RIVER (LOEs 43225, 43970, 101020, 101033, 318023, 318027, 318035, 318765, 318775, 318779, 318783), 14 of 64 samples exceed the cold freshwater habitat beneficial use objective. For GARCIA CREEK (LOE 318079), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For MILL CREEK (LOEs 318321, 318325, 318329), 0 of 16 samples exceed the cold freshwater habitat beneficial use objective. For OLD OUTLET CREEK (LOEs 318355, 318360, 318365, 318369, 318373), 35 of 46 samples exceed the cold freshwater habitat beneficial use objective. For OUTLET CREEK (LOEs 318380, 318391, 318395, 318399), 26 of 40 samples exceed the cold freshwater habitat beneficial use objective. For PANTHER CREEK (LOE 100995), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For RATTLESNAKE CREEK (LOE 101034), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For RICE CREEK (LOE 101022), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For THISTLE GLADE CREEK (LOE 101035), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For TROUT CREEK (LOEs 101023, 318672), 0 of 2 samples exceed the cold freshwater habitat beneficial use objective. For UPP CREEK (LOEs 318676, 318680, 318684), 0 of 4 samples exceed the cold freshwater habitat beneficial use objective. For UPPER HAEHL CREEK (LOEs 318688, 318692, 318696), 0 of 8 samples exceed the cold freshwater habitat beneficial use objective. For EEL RIVER HU, UPPER MAIN HA (INCLUDES TOMKI CREEK) (LOEs 4784, 31521, 46803), water temperatures are established to greater than natural conditions to the impairment of aquatic organisms. This listing applies to the entire waterbody.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	For BAECHTEL CREEK (LOEs 317841, 317845, 317849), 2 of 18 samples exceed the cold freshwater habitat beneficial use objective. For BEAR CREEK (LOEs 101029, 317872), 0 of 2 samples exceed the cold freshwater habitat beneficial use objective. For BERRY CREEK (LOEs 317883, 317888, 317893, 317897), 34 of 41 samples exceed the cold freshwater habitat beneficial use objective. For BLUE SLIDES CREEK (LOEs 101018, 101030, 317918), 0 of 10 samples exceed the cold freshwater habitat beneficial use objective. For BUCKNELL CREEK (LOEs 101099, 133579), 0 of 4 samples exceed the cold freshwater habitat beneficial use objective. For COLD CREEK (LOE 101031), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For COPPER BUTTE CREEK (LOE 317962), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For CORBIN CREEK (LOEs 101032, 317971), 0 of 7 samples exceed the cold freshwater habitat beneficial use objective. For DAVIS CREEK (LOEs 317977, 317982, 317987, 317992, 317996, 318000), 46 of 87 samples exceed the cold freshwater habitat beneficial use objective. For EEL RIVER (LOEs 43225, 43970, 101020, 101033, 318023, 318027, 318035, 318765, 318775, 318779, 318783), 14 of 64 samples exceed the cold freshwater habitat beneficial use objective. For GARCIA CREEK (LOE 318079), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For MILL CREEK (LOEs 318321, 318325, 318329), 0 of 16 samples exceed the cold freshwater habitat beneficial use objective. For OLD OUTLET CREEK (LOEs 318355, 318360, 318365, 318369, 318373), 35 of 46 samples exceed the cold freshwater habitat beneficial use objective. For OUTLET CREEK (LOEs 318380, 318391, 318395, 318399), 26 of 40 samples exceed the cold freshwater habitat beneficial use objective. For PANTHER CREEK (LOE 100995), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For RATTLESNAKE CREEK (LOE 101034), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For RICE CREEK (LOE 101022), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For THISTLE GLADE CREEK (LOE 101035), 0 of 1 sample exceeds the cold freshwater habitat beneficial use objective. For TROUT CREEK (LOEs 101023, 318672), 0 of 2 samples exceed the cold freshwater habitat beneficial use objective. For UPP CREEK (LOEs 318676, 318680, 318684), 0 of 4 samples exceed the cold freshwater habitat beneficial use objective. For UPPER HAEHL CREEK (LOEs 318688, 318692, 318696), 0 of 8 samples exceed the cold freshwater habitat beneficial use objective. For EEL RIVER HU, UPPER MAIN HA (INCLUDES TOMKI CREEK) (LOEs 4784, 31521, 46803), water temperatures are established to greater than natural conditions to the impairment of aquatic organisms. This listing applies to the entire waterbody.

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318035

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project SWAMP RWB1 Monitoring and determined that 0 of 22 samples exceed the July-October maximum temperature of 24 degrees Celcius and 0 of 14 samples exceed the November-June maximum water temperature of 20 degrees Celcius, so that 0 of 36 samples exceed the water quality objective for temperature.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.

Guideline Reference:

Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region

Spatial Representation:

These samples were collected at sampling station name: Eel River at Trout Creek Campground; station code: 111ER8102

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016-8/14/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318329

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 2 samples exceed the July-October maximum of 24 degrees Celcius and 0 of 4 samples exceed the November-June maximum of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, upstream; station code: BA-8.

Temporal Representation:

These samples were collected from 4/21/2011-6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318325

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Report Program and determined that 0 of 2 samples exceed the July-October maximum of 24 degrees Celcius and 0 of 4 samples exceed the November-June maximum of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, middle; station code: BA-9.

Temporal Representation:

These samples were collected from 4/24/2011-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318355

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 17 of 17 samples exceed the July-October maximum of 24 degrees Celcius and 2 of 2 samples exceed the November-June maximum of 20 degrees Celcius, so that 19 of 19 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area; station code: WQ-21.

Temporal Representation:

These samples were collected from 11/9/2017-7/2/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318360

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the July-October maximum of 24 degrees Celcius and 16 of 16 samples exceed the November-June maximum of 20 degrees Celcius, so that 16 of 16 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area; station code: WQ-22.

Temporal Representation:

These samples were collected from 11/9/2017-6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318684

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 4 samples are greater than the November-June maximum of 20 degrees Celcius, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Upp Creek, upstream; station code: BA-11.

Temporal Representation:

These samples were collected from 4/8/2011-5/4/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318688

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 4 samples are greater than the November-June maximum of 24 degrees Celcius and 0 of 0 samples are greater than the July-October maximum of 20 degrees Celcius, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, downstream; station code: BA-3.

Temporal Representation:

These samples were collected from 4/7/2011-5/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318692

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 1 sample is greater than the November-June maximum of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Upper Haehl Creek, middle; station code: BA-2.

Temporal Representation:

This sample was collected on 4/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318696

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 are greater than the July-October maximum of 24 degrees Celcius and 0 of 3 samples are greater than the November-June maximum of 20 degrees Celcius, so that 0 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, upper; station code: BA-1.

Temporal Representation:

These samples were collected from 4/6/2011-5/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318373

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samplse were greater than the July-October maximum of 24 degrees Celcius and 0 of 3 samples are greater than the November-June maximum of 20 degrees Celcius, so that 0 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, upstream; station code: BA-16.

Temporal Representation:

These samples were collected from 4/4/2011-4/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

4784

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unknown

Temporal Representation:

Unknown

Environmental Conditions:

Unknown

QAPP Information:

Unknown

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43970

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Water Temperature.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.

Objective/Criterion Reference:

Evaluation Guideline:

Per "Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids" (Carter 2008): The lethal temperature evaluation guideline for both steelhead adult migration & holding and juvenile growth & rearing of 24°C applies in this water body July-October. The lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C and applies November-June in this water body. See LOE ID 31521 for more information on natural temperature alterations and salmonid presence and periodicity in this water body.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Outlet Creek - 111PS0008 ]

Temporal Representation:

Data was collected over the time period 9/9/2008-9/29/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

46803

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

The Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) TMDLs for Temperature and Sediment were approved by the USEPA on December 29, 2004. The TMDL concludes that anthropogenic alterations to riparian canopy have increased temperatures in the Upper Main HA. Modeling results reflect that current stream temperatures are elevated compared to stream temperatures under natural conditions, and improvement in riparian canopy is needed.

Data Reference:

Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Information pertains to the Eel River HU, Upper Main HA (Includes Tomki Creek) water body.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43225

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Water Temperature.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101022

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 19.7 degrees C.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rice Creek ~0.5mi above Rice Fork (111PS0110).

Temporal Representation:

The samples were collected between the dates of 6/9/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101033

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.4mi above Trout Cr. (111ERATRC).

Temporal Representation:

The samples were collected between the dates of 10/10/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101099

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 8.9 - 16.4 degrees C.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 8/27/2013 - 10/15/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

133579

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 11/7/2013 - 12/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101018

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 5/2/2012 - 6/7/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101035

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Thistle Glade Creek ~1mi above Eel River (111TGCAER).

Temporal Representation:

The samples were collected between the dates of 7/24/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101029

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bear Creek ~1.2mi above Blue Slides Cr. (111FS0001).

Temporal Representation:

The samples were collected between the dates of 7/5/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101030

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 7/6/2011 - 7/19/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101031

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Cold Creek above Eel River (111FS0007).

Temporal Representation:

The samples were collected between the dates of 7/11/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101020

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.75 miles above Wesley Ives Creek (111WE0816).

Temporal Representation:

The samples were collected between the dates of 6/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101032

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Corbin Creek ~0.1mi abive Eel River (111CBCAER).

Temporal Representation:

The samples were collected between the dates of 8/8/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101023

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Trout Creek ~0.1mi above Eel River (111WER003).

Temporal Representation:

The samples were collected between the dates of 6/10/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101034

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rattlesnake Creek ~0.5mi above Eel River (111WER008).

Temporal Representation:

The samples were collected between the dates of 7/23/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100995

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Panther Creek ~2.6mi above Welch Cr. (111PS0160).

Temporal Representation:

The samples were collected between the dates of 7/25/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

31521

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

The following process is utilized to interpret the narrative temperature objective in the Basin Plan for impairment assessments. Step 1: Determine if temperatures reflect natural conditions. If Yes, then the water body is not considered impaired, if No, then go to Step 2. Step 2: Determine if temperatures adversely affect beneficial uses. If Yes, then the water body is considered impaired, if No , then go to Step 3. Step 3: Determine if temperatures are increased by 5 degrees F. If Yes, then water body is impaired, if No, then water body is not impaired.

Data Reference:

Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EVIDENCE OF ALTERATION OF NATURAL RECEIVING WATER TEMPERATURES (NON-NATURAL TEMPS): The water temperatures of the Eel River HU, Upper Main HA do not reflect natural conditions as environmental factors that influence water temperature have been altered by riparian shade removal and flow alterations due to dam construction (USEPA 2004). EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are present in the watershed (USEPA 2004). Rearing occurs year round and spawning/ incubation/ emergence occurs from November to June (Busby et al. 1996; CDFG 2004; Myers et al. 1998). Non-core rearing occurs in the mainstem Upper Main Eel River, while core rearing occurs in tributaries to the Upper Main.

Guideline Reference:

Recovery Strategy for California Coho Salmon: Report to the California Fish and Game Commission

Guideline Reference:

Status Review of Chinook Salmon from Washington, Idaho, Oregon, and California.

Guideline Reference:

Status Review of West Coast Steelhead from Washington, Idaho, Oregon, and California

Guideline Reference:

Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment

Spatial Representation:

Information pertains to the Eel River HU, Upper Main HA (Includes Tomki Creek)

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318380

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 9 of 9 samples are greater than the July-October maximum of 24 degrees Celcius and 16 of 16 samples are greater than the November-June maximum of 20 degrees Celcius, so that 25 of 25 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek downstream of Davis Creek confluence; station code: WQ-27.

Temporal Representation:

These samples were collected from 10/19/2017-7/16/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318775

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Adventure Scientists (Volunteer)* and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 1 sample is greater than the November-June maximum of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.38.123.1; station code: ADVENTURESCIENTISTS-39.38.123.1.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318369

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 1 sample is greater than the July-October maximum of 24 degrees Celcius and 0 of 3 samples are greater than the November-June maximum of 20 degrees Celcius, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, middle; station code: BA-17.

Temporal Representation:

These samples were collected from 4/26/2011-4/8/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318365

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, downstream; station code: BA-18.

Temporal Representation:

These samples were collected from 5/24/2011-4/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318765

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for USGS California Water Science Center and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 1 sample is greater than the November-June maximum of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA; site code: USGS-11471500.

Temporal Representation:

This sample was collected on 6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318391

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 3 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 1 sample are greater than the November-June maximum of 20 degrees Celcius, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, downstream; station code: BA-15.

Temporal Representation:

These samples were collected from 4/10/2011-8/11/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318395

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 1 of 3 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 2 samples are greater than the November-June maximum of 20 degrees Celcius, so that 1 of 5 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, middle; station code: BA-14.

Temporal Representation:

These samples were collected from 4/11/2011-8/12/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318399

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 3 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 3 samples are greater than the November-June maximum of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, upstream; station code: BA-7.

Temporal Representation:

These samples were collected from 4/23/2011-7/22/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318672

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for SWAMP Reference Condition Management Plan and determined that 0 of 1 sample is greater than the July-October maximum of 24 degrees Celcius and 0 of 0 samples are greater than the November-June maximum of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Trout Creek ~0.2mi above Eel River; station code: 111TTCAER

Temporal Representation:

This sample was collected on 6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318676

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the July-October maximum of 24 degrees Celcius and 0 of 4 samples exceed the November-June maximum of 20 degrees Celcius, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, downstream; station code: BA-13.

Temporal Representation:

These samples were collected from 4/5/2011-5/2/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318680

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, middle; station code: BA-12.

Temporal Representation:

These samples were collected from 4/5/2011-5/3/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318783

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Adventure Scientists (Volunteer)* and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 1 of 1 sample is greater than the November-June maximum of 20 degrees, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.63.123.34; station code: ADVENTURESCIENTISTS-39.63.123.34.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318779

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Adventure Scientists (Volunteer)* and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 1 of 1 sample is greater than the November-June maximum of 20 degrees, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.49.123.23; station code: ADVENTURESCIENTISTS-39.49.123.23.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317845

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 2 samples exceed the temperature water quality objective for July-October and 0 of 4 samples exceed the temperature water quality objective for November-June, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, middle; station code: BA-5

Temporal Representation:

These samples were collected from 7/21/2011-7/12/2022

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317872

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that 0 of 0 samples exceed the temperature water quality objective of 24 degrees C for July-October and 0 of 1 sample exceeds the water quality objective of 20 degrees C for November-June, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: Bear Creek below FS road 17NO2; station code: 111CE0551

Temporal Representation:

This sample was collected on 5/27/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317883

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the temperature water quality objective of 24 degrees C for July-October and 16 of 16 samples exceed the water quality objective of 20 degrees C for November-June, so that 16 of 16 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek downstream of parcel 108-060-02; station code: WQ-28

Temporal Representation:

These samples were collected from 11/17/2017-6/5/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317888

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the temperature water quality objective of 24 degrees C for July-October and 18 of 18 samples exceed the water quality objective of 20 degrees C for November-June, so that 18 of 18 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek upstream of Category 1 riparian creation on parcel 108-070-09; station code: WQ-26.

Temporal Representation:

These samples were collected from 11/16/2017-6/26/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317893

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the temperature water quality objective of 24 degrees C for July-October and 0 of 3 samples exceed the water quality objective of 20 degrees C for November-June, so that 0 of 3 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sample station name: Berry Creek, downstream; station code: BA-24.

Temporal Representation:

These samples were collected on 4/12/2011, 5/14/2018, and 7/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317897

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 1 sample exceeds the temperature water quality objective of 24 degrees C for July-October and 0 of 3 samples exceed the water quality objective of 20 degrees C for November-June, so that 0 of 4 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station: Berry Creek, upstream; station ID: BA-25

Temporal Representation:

These samples were collected on 4/13/2011, 7/10/2011, 5/15/2018, and 4/6/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317849

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 3 samples exceed the temperature water quality objective for July-October and 0 of 3 samples exceed the temperature water quality objective for November-June, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, upper; station code: BA-4

Temporal Representation:

These samples were collected from 4/22/2011-7/13/2023

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317841

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, downstream; station code: BA-6.

Temporal Representation:

These samples were collected from 4/23/2011-7/21/2021

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317982

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 5 of 5 samples exceed the July-October water quality objective of 24 degrees Celcius and 17 of 17 samples exceed the November-June water quality objective of 20 degrees Celcius, so that 22 of 22 samples exceed the water quality objective for temperature.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-060-01; station code: WQ-24.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317918

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that 0 of 2 samples exceed the July-October water quality objective of 24 degrees Celcius and 0 of 4 samples exceed the November-June water quality objective of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Blue Slides Creek above Bear Cr.; station code: 111FS0008.

Temporal Representation:

These samples were collected from 6/1/2016-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317987

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 7 of 7 samples exceed the July-October water quality objective of 24 degrees Celcius and 16 of 16 samples exceed the November-June water quality objective of 20 degrees Celcius, so that 23 of 23 samples exceed the water quality objective for temperature.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek upstream of parcel 108-070-08; station code: WQ-23.

Temporal Representation:

These samples were collected from 10/20/2017-7/19/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317992

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 1 of 3 samples exceed the July-October water quality objective of 24 degrees Celcius and 0 of 3 samples exceed the November-June water quality objective of 20 degrees Celcius, so that 1 of 6 samples exceed the water quality objective for temperature.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Davis Creek, downstream; station code: BA-21.

Temporal Representation:

These samples were collected from 5/24/2011-7/14/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317996

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 of 3 samples exceed the July-October water quality objective of 24 degrees Celcius and 0 of 3 samples exceed the November-June water quality objective of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective for temperature.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, middle; station code: BA-20.

Temporal Representation:

These samples were collected from 4/25/2011-7/15/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318000

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, upstream; station code: BA-19.

Temporal Representation:

These samples were collected from 4/9/2011-7/16/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318079

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data and determined that 0 of 1 sample exceeds the July-October maximum of 24 degrees Celcius and 0 of 0 samples exceed the November-June maximum of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective for temperature.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Garcia Creek above Bear Pen Cr.; station code: 111GCABPC

Temporal Representation:

This sample was collected on 7/24/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317962

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data for parent project SWAMP Reference Condition Management Plan and determined that 0 of 0 samples exceed the July-October water quality objective of 24 degrees Celcius and 0 of 1 sample exceeds the November-June water quality objective of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective for temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Copper Butte Creek ~0.5mi above Eel River; station code: 111WER159

Temporal Representation:

This sample was collected on 11/6/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318023

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for the parent project SWAMP RWB1 Monitoring and determined that 3 of 5 samples exceed the July-October water quality objective of 24 degrees Celcius and 3 of 3 samples exceed the November-June water quality objective of 20 degrees Celcius, so that 6 of 8 samples exceed the water quality objective for temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Dos Rios; station code: 111ER6140.

Temporal Representation:

These samples were collected from 6/7/2018-8/2/2019

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318027

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project SWAMP RWB1 Monitoring and determined that 4 of 6 samples exceed the minimum temperature of 24 degrees Celcius for July-October and 2 of 2 samples exceed the minimum temperature of 20 degrees Celcius for November-June, so that 6 of 8 samples exceed the water quality objective for temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Outlet Creek; station code: 111ER6381.

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317971

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data from parent project SWAMP Reference Condition Management Plan and determined that 0 of 3 samples exceed the July-October water quality objective of 24 degrees Celcius and 0 of 3 samples exceed the November-June water quality objective of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective for temperature.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Corbin Creek ~0.1mi above NF; station code: 111CBCANI

Temporal Representation:

These samples were collected from 6/2/2016-6/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317977

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 of 7 samples exceed the July-October water quality objective of 24 degrees Celcius and 0 of 17 samples exceed the November-June water quality objective of 20 degrees Celcius, so that 0 of 24 samples exceed the water objective for temperture.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-010-06; station code: WQ-25.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155299, Temperature, water	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318321

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, downstream; station code: BA-10.

Temporal Representation:

These samples were collected from 4/24/2011-5/31/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	103961	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	2,3,4,6-tetrachlorophenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. None of the 2 samples exceed the objective for protection of MUN. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of 2 samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103961, 2,3,4,6-tetrachlorophenol	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

25591

Pollutant:

2,3,4,6-tetrachlorophenol

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the two 2,3,4,6-tetrachlorophenol samples collected in the Upper Mainstem Eel River watershed exceed the evaluation guideline. Both samples were detected but not quantified (with a reporting limit of 0.002 ug/l). The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the "Quality Criteria for Water 1986" (USEPA 1986), also known as the Gold Book: The 2,3,4,6-tetrachlorophenol criterion to control undesirable taste and odor qualities of ambient water is estimated at 1.0 ug/l.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Samples were collected from the Upper Mainstem Eel River near Hearst (SWAMP Station ID 111EELHST). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Samples were collected from February 2002 to June 2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	169786	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Aldicarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109582 has been replaced by LOE 348996 and LOE 109584 has been replaced by LOE 348969 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 169786, Aldicarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

348969

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169786, Aldicarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109583

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for aldicarb incorporated by reference in the Water Quality Control Plan, North Coast Basin is 3 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169786, Aldicarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

348996

Pollutant:

Aldicarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	102594	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Aldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3 of the Listing Policy. Under section 3 a single line of evidence are necessary to assess listing status. Seven lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118824

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L . This established criteria was divided by 2 in order to better represent a CMC value as specified in footnote g of Table (b)(1) of the California Toxics Rule, 2000.

Objective/Criterion Reference:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106415

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121423

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Aldrin. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Aldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122591

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Aldrin, Total. One sample result was not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122590

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Aldrin, Total. Nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121231

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 102594, Aldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107643

Pollutant:

Aldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157298	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Alkalinity as CaCO3
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Ninety-three lines of evidence are available in the administrative record to assess this pollutant. For the COLD beneficial use, 12 of 725 samples exceed the objective and for the WARM beneficial use, 1 of 144 samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. For the COLD beneficial use, 12 of 725 samples exceed the objective and for the WARM beneficial use, 1 of 144 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323037

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-13 (Upp Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-05 and 2021-05-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323044

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-1 (Upper Haehl Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2011-04-06 and 2022-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323087

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-9 (Mill Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-24 and 2022-06-01

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323090

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-24 (Berry Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2022-04-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323091

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-16 (Old Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-04 and 2022-04-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323096

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111TTCAER (Trout Creek ~0.2mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2022-06-02 and 2022-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323109

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-8 (Mill Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-21 and 2022-06-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323112

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-08-17 and 2019-07-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323124

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-15 (Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-10 and 2022-08-11

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323137

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-4 (Baechtel Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2011-04-22 and 2022-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323144

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-2 (Upper Haehl Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-06 and 2011-04-06

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322951

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-12 (Upp Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-05 and 2021-05-03

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323062

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-10 (Mill Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-24 and 2022-05-31

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323064

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-18 (Old Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2022-04-07

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323067

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-11 (Upp Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-08 and 2021-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322962

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322964

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-22 (Berry Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-13 and 2022-04-06

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322976

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-17 (Old Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-26 and 2022-04-08

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322986

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-19 (Davis Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-09 and 2022-07-16

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322993

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2017-06-21 and 2022-06-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322994

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322999

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-21 (Davis Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2022-07-14

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322895

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2015-05-27

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323015

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-3 (Upper Haehl Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-07 and 2022-05-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322913

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-7 (Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-23 and 2021-07-22

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323049

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2017-06-20 and 2022-06-01

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323050

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323053

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323148

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-2 (Upper Haehl Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-06 and 2011-04-06

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323113

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-4 (Baechtel Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2011-04-22 and 2022-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323126

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-10 (Mill Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-24 and 2022-05-31

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323127

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-24 (Berry Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2022-04-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323130

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-16 (Old Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-04 and 2022-04-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323134

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-6 (Baechtel Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-23 and 2021-07-21

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323145

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-18 (Old Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2022-04-07

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322950

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-12 (Upp Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-05 and 2021-05-03

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322952

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322961

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323080

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-14 (Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-11 and 2022-08-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322968

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323077

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-20 (Davis Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-25 and 2022-07-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323079

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-21 (Davis Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2022-07-14

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322985

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-5 (Baechtel Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-22 and 2022-07-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322991

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2017-06-21 and 2022-06-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322996

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-13 (Upp Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-05 and 2021-05-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322894

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2015-05-27

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323003

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-22 (Berry Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-13 and 2022-04-06

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323016

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-3 (Upper Haehl Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-07 and 2022-05-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323026

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-11 (Upp Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-08 and 2021-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323027

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111TTCAER (Trout Creek ~0.2mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2022-06-02 and 2022-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323030

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-08-17 and 2019-07-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322922

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-9 (Mill Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-24 and 2022-06-01

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322925

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-15 (Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-10 and 2022-08-11

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322926

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2017-06-20 and 2022-06-01

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323033

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-7 (Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-23 and 2021-07-22

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323034

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327841

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327868

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108297

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117292

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119150

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 51 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109235

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106834

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118826

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323052

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323056

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-17 (Old Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-26 and 2022-04-08

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323024

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-5 (Baechtel Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-22 and 2022-07-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323029

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-6 (Baechtel Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-23 and 2021-07-21

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102325

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119152

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 64 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119560

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 54 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119151

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 62 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117270

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119155

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 44 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116289

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0110)

Temporal Representation:

The samples were collected between the dates of 2014-06-09 and 2014-06-09

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116311

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119156

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 61 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115815

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108331

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113118

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 70 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-10-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108431

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0007)

Temporal Representation:

The samples were collected between the dates of 2011-07-11 and 2011-07-11

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102291

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2012-07-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119157

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111210

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 61 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116771

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Perennial Stream Surveys data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0160)

Temporal Representation:

The samples were collected between the dates of 2011-07-25 and 2011-07-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106207

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 51 samples exceeded the water quality standard for Alkalinity as CaCO3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103962

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323040

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-8 (Mill Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-21 and 2022-06-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322935

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-1 (Upper Haehl Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2011-04-06 and 2022-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

322945

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-19 (Davis Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-09 and 2022-07-16

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323031

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-14 (Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-11 and 2022-08-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323035

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157298, Alkalinity as CaCO3	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323036

Pollutant:

Alkalinity as CaCO3

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Alkalinity as CaCO3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-20 (Davis Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-25 and 2022-07-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	101972	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Ametryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 101972, Ametryn	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118857

Pollutant:

Ametryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	104109	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Aminomethyl Phosphonic Acid (AMPA)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 104109, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118896

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 104109, Aminomethyl Phosphonic Acid (AMPA)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118897

Pollutant:

Aminomethyl Phosphonic Acid (AMPA)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	161404	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111646

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2011-07-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118859

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110487

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34574

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. Both data are reported as quantitation limits. These quantitation limits are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.

Guideline Reference:

1999 Update of Ambient Water Quality Criteria for Ammonia

Spatial Representation:

Samples were collected at 111PS0008 (Outlet Creek).

Temporal Representation:

Samples were collected on 9/9/2008 and 9/29/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34511

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. 3 of the 4 data are reported as non-detect limits. These non-detect limits are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

1999 Update of Ambient Water Quality Criteria for Ammonia

Spatial Representation:

Sample was collected at 111ER6140 (Eel River above Dos Rios).

Temporal Representation:

Samples collected between 11/13/2007 and 2/26/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114998

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111453

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2012-07-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114466

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115760

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111569

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117490

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109172

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103539

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111635

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0007)

Temporal Representation:

The samples were collected between the dates of 2011-07-11 and 2011-07-11

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118860

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113707

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108364

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107631

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110656

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110531

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114632

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2011-07-06

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118861

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323343

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2019-09-10 and 2021-08-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323554

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2021-06-02 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323359

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323361

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2019-09-10 and 2021-08-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323476

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-09-13 and 2019-07-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323373

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323379

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2015-05-27

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323489

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-08-17 and 2019-07-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323380

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2015-05-27

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323492

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323503

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-09-13 and 2019-07-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323288

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2018-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323399

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323511

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323292

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323515

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323413

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-10-29 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323414

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323416

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323417

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2021-06-02 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323436

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2019-09-10 and 2021-08-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323440

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323441

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323356

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102697

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 38 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112927

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 49 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119426

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 54 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111254

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107010

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 57 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107008

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 55 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107157

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 64 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-10-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112926

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119196

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 56 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107113

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality standard for Ammonia as NH3.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

26311

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 41 ammonia as nitrogen samples collected from Upper Mainstem Eel River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)).

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115009

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114954

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104551

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161404, Ammonia	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113245

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157278	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Antimony
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102611

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110988

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113195

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102511

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327941

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327959

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102576

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110949

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106245

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106239

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106250

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110952

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107023

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105526

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110968

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106226

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114386

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106234

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113069

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111261

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105501

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102582

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102494

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114366

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113060

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110972

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105497

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119203

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106257

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119805

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102512

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106242

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102449

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106196

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111023

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102599

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113205

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113191

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119583

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102541

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110985

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113114

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107134

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111277

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111011

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107088

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112897

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102545

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111007

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119561

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111021

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106277

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110979

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106293

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110981

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117148

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119529

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113089

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102491

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114429

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113027

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111019

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106279

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110999

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119138

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106275

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102469

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113113

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106186

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113011

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102455

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119511

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102495

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119573

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113126

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106309

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113214

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102606

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102521

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119539

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111018

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117200

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107024

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119135

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117147

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111020

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119128

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102623

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110982

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113037

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107147

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119447

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107067

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106256

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119396

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110958

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102554

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110969

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110960

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114375

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110944

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114367

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110965

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110978

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Antimony.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that toxicity to algae occurs at antimony concentrations as low as 610 ug/L.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105473

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102510

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102533

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102526

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119508

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119532

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112991

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119490

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119421

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114339

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102595

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113201

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102460

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112988

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113199

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113202

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119555

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119496

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323642

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Antimony.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323639

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Antimony.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323638

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Antimony.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323637

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Antimony.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323635

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323636

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Antimony. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323640

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Antimony.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323641

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Antimony.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327940

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Antimony criterion for the protection of human health from consumption of organisms only is 4,300 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157278, Antimony	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327977

Pollutant:

Antimony

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for antimony incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.006 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	157279	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328022

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107078

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102509

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

41401

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114392

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108988

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102651

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102478

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102549

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102477

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122612

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Arsenic, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122613

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Arsenic, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119495

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102480

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102560

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113105

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113718

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113034

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102604

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106259

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114451

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102520

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102614

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114391

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113106

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113072

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106269

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112974

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105539

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102654

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108618

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102615

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113208

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119515

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106229

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114334

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102690

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117208

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113041

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106218

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119545

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106214

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113197

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119571

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113047

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119435

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105482

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111245

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105499

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105469

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105225

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119516

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102580

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106187

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111761

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102535

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106217

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113059

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119527

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106311

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117211

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113062

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113054

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119500

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111239

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119544

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119187

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114357

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119408

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114336

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107080

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102583

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119504

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119434

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105500

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323671

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323707

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323659

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323670

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Arsenic.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327984

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327983

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119176

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119193

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114337

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102536

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102689

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106211

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110945

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119437

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102456

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113215

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114368

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105471

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113192

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111762

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106247

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106235

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113217

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106221

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122281

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Arsenic .

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000a).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122252

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000a).

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114181

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112969

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113024

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102557

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115771

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102519

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113211

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111958

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119541

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119139

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113032

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102552

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102457

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102612

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102619

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113033

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110970

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114445

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106264

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102550

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102490

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106312

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114449

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102648

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122614

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 20 samples exceed the criterion for Arsenic, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 2/4/2002-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112980

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102657

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114414

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113001

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119537

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102466

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114421

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113111

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112990

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114352

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105483

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113048

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113030

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119140

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120080

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102503

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108977

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104007

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157279, Arsenic	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102652

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Arsenic.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	103117	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Atrazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103117, Atrazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122615

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Atrazine, Total. Seven sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 6/25/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 103117, Atrazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103018

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity."

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 103117, Atrazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103017

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103117, Atrazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103016

Pollutant:

Atrazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	104139	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Azinphos, Ethyl (Ethyl Guthion)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Three line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 104139, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122627

Pollutant:

Azinphos, Ethyl (Ethyl Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Azinphos Ethyl, Total. One sample result was not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to National Academy of Sciences Water Quality Criteria (1972), the Azinphos, Ethyl (Ethyl Guthion) criteria is 0.0875 mg/L. (EPA-R3-73-033)

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104139, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101847

Pollutant:

Azinphos-methyl (Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104139, Azinphos, Ethyl (Ethyl Guthion)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122626

Pollutant:

Azinphos, Ethyl (Ethyl Guthion)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Azinphos Ethyl, Total. Nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to National Academy of Sciences Water Quality Criteria (1972), the Azinphos, Ethyl (Ethyl Guthion) criteria is 0.0875 mg/L. (EPA-R3-73-033)

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157280	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Barium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102701

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114340

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107112

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113049

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105495

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119439

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111265

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119191

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119195

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105502

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119444

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119201

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119202

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113045

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105480

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105489

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111272

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107119

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107102

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114345

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323747

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Barium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323748

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Barium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328055

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105466

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119581

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111247

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107125

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117209

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119190

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102686

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102671

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106197

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106195

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119182

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119502

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106322

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113014

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113016

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102672

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114338

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119185

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113013

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157280, Barium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111269

Pollutant:

Barium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Barium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for barium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	157281	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Beryllium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119400

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107082

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323796

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Beryllium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323795

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Beryllium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA National Recommended Water Quality Criterion chronic toxicity threshold for beryllium for freshwater aquatic life protection is 5.3 ug/l (4 day average)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323799

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Beryllium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323798

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Beryllium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107138

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112930

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107087

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112896

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107116

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119481

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105523

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117153

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110976

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117149

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112934

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111237

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107132

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105521

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112917

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117126

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107059

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119479

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119450

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119477

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113074

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105514

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111289

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107063

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102631

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119820

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102640

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111211

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111003

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119394

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107065

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117172

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107089

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323797

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Beryllium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA National Recommended Water Quality Criterion chronic toxicity threshold for beryllium for freshwater aquatic life protection is 5.3 ug/l (4 day average)

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323800

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Beryllium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102675

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107155

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107135

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119838

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102677

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119469

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119818

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106292

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111267

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107068

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105504

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117131

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107076

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107066

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119853

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107037

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112893

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107036

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111225

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107142

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112911

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102564

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112939

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107053

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102643

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117158

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111217

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112916

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119160

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119158

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112945

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107079

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107096

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107085

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110994

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117192

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117169

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113000

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112920

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA criteria for water quality states chronic toxicity to freshwater aquatic life for berrylium occurs at a concentration of 0.0053 mg/L. (USEPA, 1986).

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119807

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107091

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102650

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106310

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112894

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157281, Beryllium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119863

Pollutant:

Beryllium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Beryllium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for beryllium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	169785	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Bifenthrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 110199 has been replaced by LOE 349064 due to a reassessment of data using the chronic criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 169785, Bifenthrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349051

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Bifenthrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for bifenthrin is 0.1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of bifenthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Bifenthrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169785, Bifenthrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349064

Pollutant:

Bifenthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Bifenthrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Bifenthrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	165873	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Bolstar
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165873, Bolstar	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122639

Pollutant:

Bolstar

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Bolstar, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165873, Bolstar	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122628

Pollutant:

Bolstar

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Bolstar, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	158439	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Boron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 158439, Boron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328087

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Drinking water notification levels are published by the Division of Drinking Water. Notification levels are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The notification level for Boron is 1 mg/L.

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158439, Boron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328069

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The guideline for boron is 700 ug/L (0.7 mg/L).

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158439, Boron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111591

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158439, Boron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108264

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158439, Boron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111580

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158439, Boron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34175

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the 4 samples analyzed exceeded the evaluation guideline of 0.7 mg/L.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin (NCRWQCB 2011): Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.

Objective/Criterion Reference:

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. At or below the limits presented in the Water Quality Goals tables, agricultural uses of water should not be limited. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The criteria for boron is 700 ug/L (0.7 mg/L).

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Samples were collected from the Eel River above Dos Rios station (111ER6140).

Temporal Representation:

Samples were collected approximately quarterly from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 158439, Boron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115995

Pollutant:

Boron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157282	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Cadmium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119828

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117185

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102641

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107103

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119412

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119810

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105533

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102598

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119869

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113128

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119470

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104540

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114621

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110993

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106189

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105525

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102649

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119125

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119830

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102653

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110207

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117196

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106181

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102546

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102634

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113082

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104562

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119455

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119473

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117479

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112970

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113356

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113006

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105465

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113101

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113123

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102673

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110992

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102662

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113070

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112968

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106193

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106284

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119878

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102636

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106190

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113043

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117137

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106184

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114406

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110206

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111207

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102544

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113099

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113125

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119476

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119829

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111231

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119855

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102665

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102656

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102313

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106307

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119143

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106191

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102679

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105535

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105524

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119483

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119840

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119880

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102547

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111229

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102605

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117143

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122033

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for cadmium in 4.98 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122316

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for cadmium in 4.98 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

32845

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for cadmium.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 111ER6140 (Eel River above Dos Rios).

Temporal Representation:

Samples collected between 11/13/2007 and 7/15/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105862

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105468

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102659

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

41458

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113817

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122641

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Cadmium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122640

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Cadmium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111213

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102516

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119844

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122642

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Cadmium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 3/23/2001-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119874

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111002

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323913

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323895

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323915

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323905

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110623

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110205

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119132

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112983

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106308

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107090

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119398

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157282, Cadmium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105522

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cadmium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	103001	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Carbaryl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103001, Carbaryl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110219

Pollutant:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for carbaryl as a drinking water level with a one in a million cancer risk is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103001, Carbaryl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110220

Pollutant:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA National Recommended Aquatic Life criteria pursuant to Section 304(a) of the Clean Water Act for Carbaryl is 2.1 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103001, Carbaryl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110218

Pollutant:

Carbaryl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life criterion continuous concentration expressed as a 4 day average for carbaryl is 2.1 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165874	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Carbofuran
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165874, Carbofuran	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110221

Pollutant:

Carbofuran

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.018 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	103019	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Carbophenothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103019, Carbophenothion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110222

Pollutant:

Carbophenothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Drinking water notification levels are published by the Division of Drinking Water and are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The criteria for Carbophenothion (Trithion) is 0.007 mg/L.

Guideline Reference:

CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165875	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Chlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165875, Chlordane	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105197

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165875, Chlordane	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121076

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Total Chlordanes. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum total Chlordane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165875, Chlordane	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121075

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Total Chlordanes. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for total chlordane in fish tissue is 3.9 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165875, Chlordane	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121078

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Total Chlordanes. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165875, Chlordane	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105195

Pollutant:

Chlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Chlordane criterion continuous concentration expressed as a 4-day average for the protection of aquatic life in california waters is 0.0043 ug/L (California Toxics Rule, 2000)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157283	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102072

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chloride.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2012-07-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323989

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2019-09-10 and 2021-08-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324075

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-10-29 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324089

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2018-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324011

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324017

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117891

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104897

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102116

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107653

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102105

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0110)

Temporal Representation:

The samples were collected between the dates of 2014-06-09 and 2014-06-09

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117363

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102149

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328121

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114576

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119895

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0160)

Temporal Representation:

The samples were collected between the dates of 2011-07-25 and 2011-07-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328118

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110224

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102039

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112634

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0007)

Temporal Representation:

The samples were collected between the dates of 2011-07-11 and 2011-07-11

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

44110

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Outlet Creek - 111PS0008 ]

Temporal Representation:

Data was collected over the time period 9/9/2008-9/29/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

41373

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

25427

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 41 chloride samples collected in the Upper Mainstem Eel River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324025

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2019-09-10 and 2021-08-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324059

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324015

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-10-29 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324010

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323999

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324088

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2018-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323990

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323977

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157283, Chloride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323970

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165876	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Chlorpyrifos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165876, Chlorpyrifos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106410

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Chlorpyrifos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165876, Chlorpyrifos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110240

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	104177	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Chlorpyrifos, methyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective for the MUN beneficial use(s). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective for the MUN beneficial use(s) and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 104177, Chlorpyrifos, methyl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122653

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceed the criterion for Chlorpyrifos Methyl, Total. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104177, Chlorpyrifos, methyl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122654

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Chlorpyrifos Methyl, Total. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The USEPA Health Advisory for life time exposure to Chlorpyrifos is 0.002 mg/L (EPA 820-R-11-002 Drinking Water Standards and Health Advisories, 2011).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104177, Chlorpyrifos, methyl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110238

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 104177, Chlorpyrifos, methyl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110239

Pollutant:

Chlorpyrifos, methyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	157299	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Chromium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One hundred three lines of evidence are available in the administrative record to assess this pollutant. One of one sample exceeds the COLD objective for the total fraction in sediment, 1 of 1 sample exceeds the WARM objective for the total fraction in sediment, 0 of 4 samples exceed the COLD objective for the total fraction of water, 10 of 507 samples exceed the MUN objective for the total fraction of water, and zero samples exceed the objectives for the dissolved fraction of water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one sample exceeds the COLD objective for the total fraction in sediment, 1 of 1 sample exceeds the WARM objective for the total fraction in sediment, 0 of 4 samples exceed the COLD objective for the total fraction of water, 10 of 507 samples exceed the MUN objective for the total fraction of water, and zero samples exceed the objectives for the dissolved fraction of water, and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119848

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119129

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111268

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114430

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102590

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112972

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110241

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111209

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112987

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113784

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119872

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106297

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119867

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110975

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106240

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113223

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112993

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119834

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110998

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106273

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112998

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117171

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111284

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111291

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119845

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106268

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119821

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113094

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110963

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119127

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106301

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102633

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106288

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119554

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110996

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110242

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106295

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119837

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113092

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117175

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110974

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117162

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111013

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112995

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110997

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106266

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102499

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110977

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106248

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119822

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118671

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111288

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106208

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118452

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119823

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118430

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114426

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110243

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113066

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114341

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119856

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121866

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the evaluation guideline for Chromium .

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for chromium in 111 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121869

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for chromium in 111 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

33957

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for chromium III or the criteria for chromium VI.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each chromium III sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. The criterion continuous concentration (4-day average) to protect aquatic life in freshwater for chromium VI is 11 ug/L and is not hardness dependent.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 111ER6140 (Eel River above Dos Rios)

Temporal Representation:

Samples collected between 11/13/07 and 7/15/08.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106176

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117150

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119165

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 35 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119865

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119536

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112999

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118767

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119410

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102534

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102556

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119533

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106321

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105367

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113005

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102523

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106174

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119406

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106188

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 13 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117203

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 13 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122667

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Chromium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 3/23/2001-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120269

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102542

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122655

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Chromium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119170

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122656

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Chromium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106173

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

41174

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324243

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324195

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 16 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324218

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved Chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324234

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Chromium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111221

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110961

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112600

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117166

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102593

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113061

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119876

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157299, Chromium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119839

Pollutant:

Chromium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Chromium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	165877	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Cinerin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 116802 has been replaced by LOE 349126 and LOE 116803 has been replaced by LOE 349124 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165877, Cinerin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349124

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165877, Cinerin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349126

Pollutant:

Cinerin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for cinerin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of cinerin-1 and cinerin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	165878	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Ciodrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165878, Ciodrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122668

Pollutant:

Ciodrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ciodrin, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165878, Ciodrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122669

Pollutant:

Ciodrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ciodrin, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157284	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Cobalt
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119443

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117155

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117186

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106236

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106230

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117182

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111279

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102578

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114361

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119809

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110950

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119452

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102489

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114363

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106219

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111274

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119486

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119813

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324274

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Cobalt.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324275

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Cobalt.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328244

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107109

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107069

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112924

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112944

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112943

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107098

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117207

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111241

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107019

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119433

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102696

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107104

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111240

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107012

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119429

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112918

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105487

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112937

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107100

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107108

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119815

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157284, Cobalt	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102577

Pollutant:

Cobalt

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Cobalt.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A .05 mg/L criteria is the recommended maximum concentration of cobalt in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	157285	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Copper
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106243

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119552

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114385

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102610

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105509

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113093

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114415

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102543

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102461

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119459

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119525

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324313

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324373

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113088

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114389

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114404

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119462

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102609

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119464

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102471

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107042

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113095

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106265

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102479

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113127

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117156

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107136

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113121

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113079

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103572

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108922

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103974

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104496

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122314

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper in 149 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122242

Pollutant:

Copper

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for copper in 149 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

32860

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for copper.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 111ER6140 (Eel River above Dos Rios).

Temporal Representation:

Samples collected between 11/13/2007 and 7/15/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110777

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324342

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324279

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Copper.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328279

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328274

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328284

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106270

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102459

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113055

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114378

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102561

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113116

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117204

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119518

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119770

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114654

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111980

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104494

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106267

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119474

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114390

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102508

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110983

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119468

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102484

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114397

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102467

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113084

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104495

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113122

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114402

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102620

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113085

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119441

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119565

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119472

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119122

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113213

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102513

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102481

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112982

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102573

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113081

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112965

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119559

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114423

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111001

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111208

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106202

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119535

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102639

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106290

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114420

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110799

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119558

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114435

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113200

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122682

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112978

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111000

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122694

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112248

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113107

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

41208

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106286

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122695

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Copper, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 3/23/2001-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112890

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114437

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102628

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Copper.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157285, Copper	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119577

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Copper. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	165879	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Coumaphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165879, Coumaphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118079

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Coumaphos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165879, Coumaphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118080

Pollutant:

Coumaphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Coumaphos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165884	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Cyanazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165884, Cyanazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117636

Pollutant:

Cyanazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for cyanazine is 1 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165885	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Cyfluthrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 118255 has been replaced by LOE 349217 due to a reassessment of data using the chronic criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165885, Cyfluthrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349217

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cyfluthrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for cyfluthrin is 0.2 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of cyfluthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Cyfluthrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165885, Cyfluthrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349202

Pollutant:

Cyfluthrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cyfluthrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Cyfluthrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165886	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Cyhalothrin, Lambda
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 111188 has been replaced by LOE 349937 and LOE 113979 has been replaced by LOE 349928 due to a reassessment of data using the chronic criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165886, Cyhalothrin, Lambda	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349937

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lambda-cyhalothrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for lambda-cyhalothrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of lambda-cyhalothrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165886, Cyhalothrin, Lambda	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349928

Pollutant:

Cyhalothrin, Lambda

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lambda-cyhalothrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Lambda-cyhalothrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1


DECISION ID	161496	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Cylindrospermopsin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 161496, Cylindrospermopsin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324430

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Cylindrospermopsin.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

USEPA 10-day cylindrospermopsin health advisory for bottle-fed infants and young children of pre-school age is 0.7 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-06-14 and 2017-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161496, Cylindrospermopsin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

324433

Pollutant:

Cylindrospermopsin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 4 ug/L of cylindrospermopsin as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-06-14 and 2017-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165887	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Cypermethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 108772 has been replaced by LOE 349296 due to a reassessment of data using the chronic criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165887, Cypermethrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349254

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for cypermethrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of cypermethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Cypermethrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165887, Cypermethrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349296

Pollutant:

Cypermethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Cypermethrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165888	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	DDD (Dichlorodiphenyldichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165888, DDD (Dichlorodiphenyldichloroethane)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116840

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDD(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00083 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165888, DDD (Dichlorodiphenyldichloroethane)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122710

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDD(o,p'), Total. Eighteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165888, DDD (Dichlorodiphenyldichloroethane)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108637

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDD(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDD criterion for the protection of human health from consumption of organisms only is 0.00084 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165888, DDD (Dichlorodiphenyldichloroethane)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122711

Pollutant:

DDD (Dichlorodiphenyldichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDD(o,p'), Total. Two samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165889	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165889, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122723

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDE(o,p'), Total. Two samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165889, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101948

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDE(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165889, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122712

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDE(o,p'), Total. Eighteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165889, DDE (Dichlorodiphenyldichloroethylene)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101949

Pollutant:

DDE (Dichlorodiphenyldichloroethylene)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDE(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165890	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165890, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107636

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165890, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117640

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Total DDT criterion for the protection of human health from consumption of organisms only is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165890, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109233

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165890, DDT (Dichlorodiphenyltrichloroethane)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109234

Pollutant:

DDT (Dichlorodiphenyltrichloroethane)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The 4,4'-DDT criterion for the protection of human health from the consumption of water and organisms is 0.00059 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165891	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Dacthal
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165891, Dacthal	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117637

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of > 11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a \greater-than\" value (for example, > 265,000) and may overestimate toxicity."

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165891, Dacthal	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117639

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165891, Dacthal	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122696

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dacthal, Total. Nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. USEPA's Lifetime Health advisory level for Dacthal is 0.07 mg/L as stated on page 3 of the 2011 edition of the drinking water standards and health advisories.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

2011 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165891, Dacthal	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117638

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Lifetime Health advisory level for Dacthal is 0.07 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165891, Dacthal	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122697

Pollutant:

Dacthal

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dacthal, Total. One sample result was not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. USEPA's Lifetime Health advisory level for Dacthal is 0.07 mg/L as stated on page 3 of the 2011 edition of the drinking water standards and health advisories.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

2011 Edition of the Drinking Water Standards and Health Advisories

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165917	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Deltamethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOEs 117641 and 118035 are duplicate LOEs that have been replaced by LOE 349375, and LOE 118036 has been replaced by LOE 349349, due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165917, Deltamethrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349375

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165917, Deltamethrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349349

Pollutant:

Deltamethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	103549	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Demeton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103549, Demeton	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122724

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Demeton-s, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 103549, Demeton	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117643

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103549, Demeton	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117642

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Demeton, calculated using the IRIS Reference Dose, is 0.3 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.00004 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 103549, Demeton	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122725

Pollutant:

Demeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Demeton-s, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165918	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Diazinon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165918, Diazinon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117645

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA reference dose (RfD) as a drinking water level, the drinking water health advisory level for Diazinon is 1.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165918, Diazinon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117643

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).

Guideline Reference:

Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165919	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Dichlofenthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165919, Dichlofenthion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122737

Pollutant:

Dichlofenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dichlofenthion, Total. Two samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165919, Dichlofenthion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122736

Pollutant:

Dichlofenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dichlofenthion, Total. Eighteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	103645	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Dieldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Eight lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103645, Dieldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121450

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Dieldrin. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Dieldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103645, Dieldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121311

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Waterboard staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows: Zero of Zero samples exceeded the water quality standard for Dieldrin. Although data was collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite), all 1 sample(s) had to be thrown out due to quantitation issues.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for dieldrin in fish tissue is 0.32 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103645, Dieldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121291

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Dieldrin. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103645, Dieldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122738

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin, Total. Nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 103645, Dieldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101492

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dieldrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103645, Dieldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101493

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dieldrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103645, Dieldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122749

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin, Total. One sample result was not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 103645, Dieldrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117646

Pollutant:

Dieldrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	104164	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Dimethoate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 104164, Dimethoate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117647

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 104164, Dimethoate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117648

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 104164, Dimethoate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122750

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dimethoate, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104164, Dimethoate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122751

Pollutant:

Dimethoate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dimethoate, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165920	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Disulfoton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165920, Disulfoton	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108459

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Disulfoton. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165920, Disulfoton	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108458

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Disulfoton. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165920, Disulfoton	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117649

Pollutant:

Disulfoton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water lifetime health advisory for disulfoton is 0.7 µg/L. The Lifetime HA is based on exposure of a 70-kg adult consuming 2 liters of a water a day.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165921	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Diuron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 117650 has been replaced by LOE 349518 and LOE 117652 has been replaced by LOE 349489 due to a reassessment of data using the UC Davis Aquatic Life Criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165921, Diuron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117651

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for diuron is 2 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165921, Diuron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349518

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165921, Diuron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349489

Pollutant:

Diuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165922	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Dyfonate (Fonofos or Fonophos)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165922, Dyfonate (Fonofos or Fonophos)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117680

Pollutant:

Dyfonate (Fonofos or Fonophos)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.

Guideline Reference:

OPP Pesticide Ecotoxicity Database.

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165923	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Endosulfan
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165923, Endosulfan	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121397

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Endosulfan. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Endosulfan, Total concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165923, Endosulfan	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117662

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The Endosulfan, Total criterion for the protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165923, Endosulfan	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121396

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Endosulfan. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for endosulfan (l and ll) in fish tissue is 13,000 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; USEPA, 2000)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165923, Endosulfan	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117663

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for total endosulfan, which is the sum of alpha endosulfan and beta endosulfan, to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165923, Endosulfan	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121285

Pollutant:

Endosulfan

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Endosulfan. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165924	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Endosulfan sulfate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165924, Endosulfan sulfate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117661

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for endosulfan sulfate to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165924, Endosulfan sulfate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117660

Pollutant:

Endosulfan sulfate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165925	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Endrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165925, Endrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121038

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Endrin. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Endrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165925, Endrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121383

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Endrin. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for endrin in fish tissue is 660 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; USEPA, 2000)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165925, Endrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117667

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165925, Endrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117668

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165925, Endrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121139

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Endrin. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165925, Endrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117669

Pollutant:

Endrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	104324	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Endrin Ketone
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twp lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective for the MUN beneficial use(s). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective for the MUN beneficial use(s) and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 104324, Endrin Ketone	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122762

Pollutant:

Endrin Ketone

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceed the criterion for Endrin Ketone, Total. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104324, Endrin Ketone	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122763

Pollutant:

Endrin Ketone

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Endrin Ketone, Total. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165926	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Endrin aldehyde
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165926, Endrin aldehyde	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117664

Pollutant:

Endrin aldehyde

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165892	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Esfenvalerate/Fenvalerate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 117670 has been replaced by LOE 349560 and LOE 117671 has been replaced by 349585 due to a reassessment of data using the chronic criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165892, Esfenvalerate/Fenvalerate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349585

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Esfenvalerate. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for esfenvalerate is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of esfenvalerate were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Esfenvalerate

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165892, Esfenvalerate/Fenvalerate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349560

Pollutant:

Esfenvalerate/Fenvalerate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Esfenvalerate. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Esfenvalerate

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	165893	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Ethion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 106579 has been replaced by LOE 349676 and LOE 114913 has been replaced by LOE 349686 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165893, Ethion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122563

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethion, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165893, Ethion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117672

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Ethion, calculated using the IRIS Reference Dose, is 3.5 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.0005 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165893, Ethion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349686

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Ethion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165893, Ethion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349676

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Ethion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for ethion is the USEPA Aquatic Life Benchmark of 0.028 ug/L for invertebrates (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 165893, Ethion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122764

Pollutant:

Ethion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethion, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165894	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Ethoprop
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165894, Ethoprop	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122565

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethoprop, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165894, Ethoprop	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122564

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Ethoprop, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165894, Ethoprop	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117673

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165894, Ethoprop	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117674

Pollutant:

Ethoprop

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165895	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Famphur
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165895, Famphur	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122578

Pollutant:

Famphur

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Famphur , Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165895, Famphur	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122579

Pollutant:

Famphur

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Famphur , Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165896	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Fenchlorphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165896, Fenchlorphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122593

Pollutant:

Fenchlorphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenchlorphos, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165896, Fenchlorphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122580

Pollutant:

Fenchlorphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenchlorphos, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165897	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Fenitrothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165897, Fenitrothion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122595

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenitrothion, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165897, Fenitrothion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122594

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenitrothion, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165897, Fenitrothion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117676

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165897, Fenitrothion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117675

Pollutant:

Fenitrothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenitrothion is the USEPA Aquatic Life Benchmark of 0.087 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165898	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Fenpropathrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 117678 has been replaced by LOE 349759 and LOE 117679 has been replaced by LOE 349788 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165898, Fenpropathrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349788

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenpropathrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.0015 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165898, Fenpropathrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349759

Pollutant:

Fenpropathrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenpropathrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.0015 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	165899	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Fensulfothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165899, Fensulfothion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122607

Pollutant:

Fensulfothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fensulfothion, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165899, Fensulfothion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122606

Pollutant:

Fensulfothion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fensulfothion, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	103359	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Fenthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103359, Fenthion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114570

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 103359, Fenthion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118233

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Fenthion. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 103359, Fenthion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122616

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenthion, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 103359, Fenthion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122608

Pollutant:

Fenthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Fenthion, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	158440	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Fluoride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 158440, Fluoride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328349

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. A 1 mg/L criteria is the recommended maximum concentration of Fluoride in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158440, Fluoride	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328365

Pollutant:

Fluoride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15, Division 4, Article 4, Section 64435 (Tables 2 and 3), and Section 64444.5 (Table 5), and listed in Table 3-2 of this Plan.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Primary Maximum Contaminant Level (MCL) for Fluoride, is 2 mg/l.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	165900	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Glyphosate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165900, Glyphosate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117681

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165900, Glyphosate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117682

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for glyphosate is 700 ug/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165900, Glyphosate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117683

Pollutant:

Glyphosate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165901	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Heptachlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165901, Heptachlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117694

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165901, Heptachlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105778

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect human health from consumption of organisms only is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165901, Heptachlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121207

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Heptachlor. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165901, Heptachlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121208

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Heptachlor. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165901, Heptachlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108823

Pollutant:

Heptachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165902	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Heptachlor epoxide
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165902, Heptachlor epoxide	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122618

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor Epoxide, Total. Two sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165902, Heptachlor epoxide	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114112

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165902, Heptachlor epoxide	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122617

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor Epoxide, Total. Eighteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165902, Heptachlor epoxide	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121302

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Heptachlor Epoxide. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor Epoxide concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165902, Heptachlor epoxide	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117693

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165902, Heptachlor epoxide	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121094

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Waterboard staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows: Zero of Zero samples exceeded the water quality standard for Heptachlor Epoxide. Although data was collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite), all 1 sample(s) had to be thrown out due to quantitation issues.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for heptachlor epoxide in fish tissue is 0.93 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 1999)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Public Health Goal for Heptachlor and Heptachlor Epoxide in Drinking Water

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165902, Heptachlor epoxide	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106399

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect of human health from the consumption of water and organisms is 0.00010 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165902, Heptachlor epoxide	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121484

Pollutant:

Heptachlor epoxide

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Heptachlor Epoxide. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165941	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Hexachlorobenzene/ HCB
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165941, Hexachlorobenzene/ HCB	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121128

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Hexachlorobenzene. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for hexachlorobenzene in fish tissue is 2.8 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 2005)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165941, Hexachlorobenzene/ HCB	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110326

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Hexachlorobenzene. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165941, Hexachlorobenzene/ HCB	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106047

Pollutant:

Hexachlorobenzene/ HCB

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Hexachlorobenzene. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165942	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Hexachlorocyclohexane (HCH), alpha
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165942, Hexachlorocyclohexane (HCH), alpha	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117684

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165942, Hexachlorocyclohexane (HCH), alpha	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117685

Pollutant:

Hexachlorocyclohexane (HCH), alpha

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC to protect of human health from the consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165943	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Hexachlorocyclohexane (HCH), beta
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165943, Hexachlorocyclohexane (HCH), beta	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117686

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165943, Hexachlorocyclohexane (HCH), beta	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117687

Pollutant:

Hexachlorocyclohexane (HCH), beta

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC to protect of human health from the consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	158441	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Iron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 158441, Iron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328432

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin: Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The secondary maximum contaminant level listed in Table 64449-A for Iron is 0.3 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158441, Iron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328440

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations are intended protect aquatic organisms from chronic exposures (expressed as 4-day average concentration) in freshwater. The evaluation guideline for iron is 1,000 ug/L to protect warm freshwater habitat.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158441, Iron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328431

Pollutant:

Iron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Red Book states that based on field observations principally, a criterion of 1.0 mg/L iron for freshwater aquatic life is believed to be adequately protective.

Guideline Reference:

Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	165950	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Jasmolin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 117695 has been replaced by LOE 349866 and LOE 117696 has been replaced by LOE 349852 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165950, Jasmolin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349852

Pollutant:

Jasmolin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165950, Jasmolin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

349866

Pollutant:

Jasmolin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for jasmolin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of jasmolin-1 and jasmolin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .


DECISION ID	157287	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Lead
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Eighty-three lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118528

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119493

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112905

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102630

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117698

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105511

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2011-10-05

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107039

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2012-10-22 and 2012-10-22

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119819

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2011-10-05

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105506

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2012-10-22 and 2012-10-22

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105512

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2011-04-14 and 2011-04-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107070

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2012-10-22 and 2012-10-22

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113063

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2012-10-22 and 2012-10-22

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111218

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118408

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102683

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119415

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118517

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117699

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119178

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112904

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119180

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105454

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111253

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105486

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106179

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105488

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119485

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119399

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119403

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103772

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122025

Pollutant:

Lead

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead in 128 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122245

Pollutant:

Lead

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for lead in 128 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122630

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Lead, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107055

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2012-01-19 and 2012-11-13

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113117

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2011-10-05

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102692

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119401

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107105

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107143

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105467

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102685

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114393

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2011-03-15 and 2011-03-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

42279

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102591

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-02-13

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105516

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2011-10-05

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107048

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-02-13

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107576

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108944

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105531

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-02-13

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122631

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Lead, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 3/23/2001-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113080

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-02-29

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113076

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-02-13

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105527

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-01-19

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112979

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-02-13

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107564

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105529

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-02-13

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122629

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Lead, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107057

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Lead.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2012-05-15 and 2012-05-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105518

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-10-22

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325131

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved lead criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325126

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325144

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325173

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117869

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112933

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102678

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111256

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112906

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114450

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107016

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119574

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117697

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107101

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102517

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119414

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107011

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114333

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113009

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117206

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114328

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118441

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114448

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157287, Lead	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106319

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lead. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	165951	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Leptophos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165951, Leptophos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122643

Pollutant:

Leptophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Leptophos, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165951, Leptophos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122632

Pollutant:

Leptophos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Leptophos, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165952	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165952, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117692

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect of human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165952, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117690

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from consumption of organisms only is 0.063 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165952, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121225

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for HCH, gamma-. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for lindane in fish tissue is 4.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 2005)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165952, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117691

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.95 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165952, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121228

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for HCH, gamma-. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum Lindane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165952, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121226

Pollutant:

Lindane/gamma Hexachlorocyclohexane (gamma-HCH)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for HCH, gamma-. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165953	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Linuron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165953, Linuron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109028

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165953, Linuron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109027

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for linuron is 1.4 µg/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165953, Linuron	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109026

Pollutant:

Linuron

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165954	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Malathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165954, Malathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114026

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Aquatic life should not be affected unacceptably if the 4-day average concentration of Malathion, does not exceed 0.028 ug/L more than once every three years on the average (UC Davis Aquatic Life Criterion).

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-10-15 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165954, Malathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102266

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Malathion. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-10-15 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	158442	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Manganese
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 158442, Manganese	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328469

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158442, Manganese	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104986

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158442, Manganese	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102160

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158442, Manganese	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102183

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 158442, Manganese	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

42794

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 158442, Manganese	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109029

Pollutant:

Manganese

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	172036	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Mercury
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.11 of the Listing Policy. Under section 3.11 a single line of evidence is necessary to assess listing status. One hundred and forty-five lines of evidence are available in the administrative record to assess this pollutant.. For the DISSOLVED fraction of WATER for the COLD beneficial use, 0 of 341 samples exceed the criterion. For the TOTAL fraction of WATER for the COLD beneficial use, 0 of 341 samples exceed the criterion. For the TOTAL fraction of SEDIMENT for the COLD beneficial use, 0 of 1 samples exceed the criterion. For the DISSOLVED fraction of WATER for the COMM beneficial use, 0 of 340 samples exceed the criterion. For the TOTAL fraction of WATER for the COMM beneficial use, 1 of 340 samples exceed the criterion. For the DISSOLVED fraction of WATER for the MUN beneficial use, 0 of 340 samples exceed the criterion. For the TOTAL fraction of WATER for the MUN beneficial use, 1 of 382 samples exceed the criterion. For the DISSOLVED fraction of WATER for the WARM beneficial use, 0 of 7 samples exceed the criterion. For the TOTAL fraction of WATER for the WARM beneficial use, 0 of 7 samples exceed the criterion. For the TOTAL fraction of SEDIMENT for the WARM beneficial use, 0 of 1 samples exceed the criterion. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. For the DISSOLVED fraction of WATER for the COLD beneficial use, 0 of 341 samples exceed the criterion; for the TOTAL fraction of WATER for the COLD beneficial use, 0 of 341 samples exceed the criterion; for the TOTAL fraction of SEDIMENT for the COLD beneficial use, 0 of 1 samples exceed the criterion; for the DISSOLVED fraction of WATER for the COMM beneficial use, 0 of 340 samples exceed the criterion; for the TOTAL fraction of WATER for the COMM beneficial use, 1 of 340 samples exceed the criterion; for the DISSOLVED fraction of WATER for the MUN beneficial use, 0 of 340 samples exceed the criterion; for the TOTAL fraction of WATER for the MUN beneficial use, 1 of 382 samples exceed the criterion; for the DISSOLVED fraction of WATER for the WARM beneficial use, 0 of 7 samples exceed the criterion; for the TOTAL fraction of WATER for the WARM beneficial use, 0 of 7 samples exceed the criterion; and for the TOTAL fraction of SEDIMENT for the WARM beneficial use, 0 of 1 samples exceed the criterion. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119154

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119171

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119159

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113120

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102667

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102621

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119177

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117159

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2011-10-11 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119123

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119861

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112888

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117183

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107111

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102674

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121893

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury in 1.06 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121895

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for mercury in 1.06 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112667

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106224

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2011-10-11 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110953

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107015

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112689

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102472

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119431

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102661

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106251

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102601

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112996

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112922

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114382

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114403

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106225

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106272

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107025

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106237

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 20 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

42778

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109194

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119568

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117129

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119817

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119833

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2011-07-13 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119205

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117140

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106261

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111236

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 20 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107150

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102694

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107056

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

42741

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107077

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114417

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119161

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114335

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113124

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107081

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102502

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114428

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105540

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119174

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119873

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 23 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113129

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119124

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112921

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2011-10-11 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105455

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102488

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113002

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102450

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119183

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114419

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102548

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106291

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119167

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325258

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2012-02-13 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325257

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114408

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111257

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112976

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107054

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110971

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114126

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106231

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119126

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107587

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111258

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119842

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119445

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110941

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

42690

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117125

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2011-07-13 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106241

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102476

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112700

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119207

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2011-10-11 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110966

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2011-07-13 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112895

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 20 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113058

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 21 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122646

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Mercury, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 3/23/2001-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106276

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122645

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Mercury, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105494

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102613

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106232

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114643

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114381

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110947

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107141

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112722

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122644

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Mercury, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110943

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2011-10-11 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119864

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106280

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2011-10-11 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107064

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 23 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106192

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111214

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112923

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119149

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119172

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106175

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117165

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 23 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111280

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107154

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111224

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102626

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106203

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117195

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119179

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102681

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106246

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110987

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106254

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114401

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-11-16 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112711

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114416

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117160

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119808

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114454

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 27 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-11-17 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102682

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106263

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117139

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 10 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111262

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Mercury.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2011-10-05 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325328

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2012-02-13 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325279

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2012-02-13 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325269

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2012-02-13 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325291

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325256

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 172036, Mercury	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325280

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Mercury.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 ug/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2012-02-07 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	165940	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Merphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165940, Merphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122657

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Merphos, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165940, Merphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122658

Pollutant:

Merphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Merphos, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	103150	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Methidathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective for the MUN beneficial use(s). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective for the MUN beneficial use(s) and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103150, Methidathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118161

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 103150, Methidathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118160

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 103150, Methidathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122670

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Methidathion, Total. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 103150, Methidathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122659

Pollutant:

Methidathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceed the criterion for Methidathion, Total. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165955	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Methiocarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165955, Methiocarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118163

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165955, Methiocarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118162

Pollutant:

Methiocarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	169784	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Methomyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 118165 has been replaced by LOE 350054 and LOE 118167 has been replaced by LOE 350104 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 169784, Methomyl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118166

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for methomyl is 180 µg/L.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169784, Methomyl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350054

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169784, Methomyl	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350104

Pollutant:

Methomyl

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for methomyl is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165903	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Methoxychlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165903, Methoxychlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118168

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 µg/L.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165903, Methoxychlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118169

Pollutant:

Methoxychlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165904	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Methyl Parathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165904, Methyl Parathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109537

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Parathion, Methyl as a drinking water level is a concentration of 0.001 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165904, Methyl Parathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113360

Pollutant:

Methyl Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Methyl. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.

Guideline Reference:

Hazard Assessment of the Insecticide Methyl Parathion to Aquatic Organisms in the Sacramento River System

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165905	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Mevinphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165905, Mevinphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122672

Pollutant:

Mevinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mevinphos, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165905, Mevinphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122671

Pollutant:

Mevinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mevinphos, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165906	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Mirex
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165906, Mirex	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121200

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Waterboard staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows: Zero of Zero samples exceeded the water quality standard for Mirex. Although data was collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite), all 1 sample(s) had to be thrown out due to quantitation issues.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for mirex in fish tissue is 0.28 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008; OEHHA, 1992)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Guideline Reference:

Expedited Cancer Potency Values and Proposed Regulatory Levels for Certain Proposition 65 Carcinogens.

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165906, Mirex	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106347

Pollutant:

Mirex

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Mirex. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165907	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Molinate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165907, Molinate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122683

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Molinate, Total. Nine sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165907, Molinate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118170

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165907, Molinate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122684

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Molinate, Total. One sample result was not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165907, Molinate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118171

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165907, Molinate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118172

Pollutant:

Molinate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Molinate is the USEPA Aquatic Life Benchmark of 105 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	157288	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Molybdenum
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328566

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105532

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119879

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110954

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110986

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117164

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107035

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117127

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114453

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107115

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119816

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119480

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111016

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102625

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111283

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110967

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113004

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112910

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113040

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117194

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105453

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111290

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112915

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119871

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107130

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106300

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111025

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117202

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111008

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117198

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107041

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106296

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111212

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117130

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102666

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107072

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111276

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107123

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117142

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112935

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111014

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107033

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106213

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112898

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117133

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110956

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119854

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119465

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119849

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107050

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119475

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119868

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111232

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111285

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111026

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102664

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117187

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107153

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110989

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106314

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117154

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119835

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102622

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.01 mg/L criteria is the recommended maximum concentration of molybdenum in irrigation water.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107020

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119162

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106298

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111292

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119136

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111275

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117174

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117144

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111010

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111278

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117178

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111228

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111234

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112948

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117132

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111287

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111005

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112941

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325575

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325574

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325573

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325576

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Molybdenum. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157288, Molybdenum	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328564

Pollutant:

Molybdenum

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EPA Drinking Water Lifetime Health advisory level for Molybdenum is 0.04 mg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	165908	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Naled
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165908, Naled	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122698

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Naled, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165908, Naled	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122685

Pollutant:

Naled

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Naled, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157289	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Nickel
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One hundred fifty-four lines of evidence are available in the administrative record to assess this pollutant. Zero samples exceed any beneficial use objective for the dissolved fraction of water. One of one sample exceeds the beneficial use objective for the total fraction of sediment. Zero of four samples exceed the Cold Freshwater Habitat beneficial use objective for the total fraction in water. Zero of 559 samples exceed the Commercial or Recreational Collection of Fish, Shellfish, or Organisms beneficial use objective for the total fraction in water. Four of 519 samples exceed the Municipal & Domestic Supply beneficial use objective for the total fraction in water. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero samples exceed any beneficial use objective for the dissolved fraction of water. One of one sample exceeds the beneficial use objective for the total fraction of sediment. Zero of four samples exceed the Cold Freshwater Habitat beneficial use objective for the total fraction in water. Zero of 559 samples exceed the Commercial or Recreational Collection of Fish, Shellfish, or Organisms beneficial use objective for the total fraction in water. Four of 519 samples exceed the Municipal & Domestic Supply beneficial use objective for the total fraction in water. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113071

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119528

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113220

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102570

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110946

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106306

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105515

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119168

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112899

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114356

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118173

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114329

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107107

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114347

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118176

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113028

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119569

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112931

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119521

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114331

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114384

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106304

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114346

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119546

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113207

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105490

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118616

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102602

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111226

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105459

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119413

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106215

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113051

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112984

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111246

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106209

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113036

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106204

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105472

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102475

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110942

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119524

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102501

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115228

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102571

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113025

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114380

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112889

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111273

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119831

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119506

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114377

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119499

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119505

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118177

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105479

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118174

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102453

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104629

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113022

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105457

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102565

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102514

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325667

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328635

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328615

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328605

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328604

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119466

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112985

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119538

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119181

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

118723

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114370

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102464

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102468

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119567

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107046

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105492

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120235

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102462

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115183

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119510

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107013

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102600

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122302

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel in 48.6 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121688

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for nickel in 48.6 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

32862

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for nickel.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 111ER6140 (Eel River above Dos Rios).

Temporal Representation:

Samples collected between 11/13/2007 and 7/15/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112973

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111235

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102638

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117176

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111266

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111360

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117145

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112967

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113196

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119549

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102587

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106913

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102627

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113077

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104103

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102500

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105534

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113087

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113110

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107093

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113112

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102618

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

42983

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106278

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119550

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114440

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project ? Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114446

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project ? Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114438

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project ? Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113091

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119121

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122700

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114439

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102558

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112437

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119572

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122699

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106289

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113115

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113100

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114436

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113102

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102493

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113104

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112971

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106178

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114379

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119563

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114344

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113023

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102497

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 35 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102688

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119188

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105520

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119430

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105481

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104136

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114443

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115272

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43131

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122701

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Nickel, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 3/23/2001-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114413

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Nickel.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325655

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325656

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325653

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325614

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157289, Nickel	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325657

Pollutant:

Nickel

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Nickel.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4600 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	157290	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43966

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate+nitrite (sum as nitrogen) is 10.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Outlet Creek - 111PS0008 ]

Temporal Representation:

Data was collected over the time period 9/9/2008-9/29/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325776

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2018-10-31 and 2018-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108053

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0007)

Temporal Representation:

The samples were collected between the dates of 2011-07-11 and 2011-07-11

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108064

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112463

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0160)

Temporal Representation:

The samples were collected between the dates of 2011-07-25 and 2011-07-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117950

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101451

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2012-07-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113007

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 45 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106320

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110788

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111438

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109724

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102670

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105461

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 50 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103459

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119503

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 57 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-10-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119409

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 48 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119517

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 49 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119580

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113015

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 36 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105460

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 50 samples exceeded the water quality standard for Nitrate + Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112193

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0110)

Temporal Representation:

The samples were collected between the dates of 2014-06-09 and 2014-06-09

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325778

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality threshold for Nitrate + Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325779

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2015-05-27

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325731

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2016-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325744

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2021-08-02 and 2021-08-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325806

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2016-06-01

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325773

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325777

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2021-06-02 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325782

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrate + Nitrite as N.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-08-17 and 2017-09-13

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325750

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-09 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325752

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325761

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-10-29 and 2018-10-29

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325770

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2018-07-10 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157290, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43030

Pollutant:

Nitrate/Nitrite (Nitrite + Nitrate as N)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate+nitrite (sum as nitrogen) is 10.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan


DECISION ID	161365	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Nitrogen, Nitrate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325930

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-16 (Old Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-10 and 2022-04-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325936

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-24 (Davis Creek downstream of parcel 108-060-01).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325937

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-23 (Davis Creek upstream of parcel 108-070-08).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325938

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-28 (Berry Creek downstream of parcel 108-060-02).

Temporal Representation:

The samples were collected between the dates of 2017-11-20 and 2018-05-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325943

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-10-29 and 2018-10-29

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325944

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-12 (Upp Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2021-05-03 and 2021-05-03

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325948

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-5 (Baechtel Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2017-06-06 and 2022-07-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325951

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325953

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-9 (Mill Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2017-06-13 and 2022-06-01

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325842

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-21 (Davis Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-17 and 2022-07-14

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325954

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-18 (Old Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-16 and 2022-04-07

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325955

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-6 (Baechtel Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2021-07-21

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325848

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-8 (Mill Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-13 and 2022-06-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325850

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2019-07-16 and 2019-07-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325851

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-14 (Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2018-05-22 and 2022-08-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325853

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2018-07-10 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325855

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-24 (Berry Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-14 and 2022-04-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325859

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-19 (Outlet Creek downstream of parcel 108-020-04).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-06-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325860

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-18 (Outlet Creek downstream of parcel 108-030-05).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-08-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325864

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2019-09-10 and 2019-09-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325915

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-13 (Upp Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-05 and 2021-05-03

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325913

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-4 (Baechtel Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2017-06-07 and 2022-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325912

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2018-10-31 and 2018-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325910

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-25 (Davis Creek downstream of parcel 108-010-05).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325909

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-1 (Upper Haehl Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2018-05-08 and 2022-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325901

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-09 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325896

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-10 (Mill Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-08 and 2022-06-01

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325892

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-22 (Berry Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-15 and 2022-04-06

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325888

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-27 (Outlet Creek downstream of Davis Creek confluence).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325886

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-20 (Davis Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2018-05-18 and 2022-07-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325879

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-3 (Upper Haehl Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2022-05-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325869

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-15 (Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2022-08-11 and 2022-08-11

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325873

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-11 (Upp Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-12 and 2021-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325875

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103828

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117880

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111416

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119420

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 57 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111248

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 54 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102687

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119184

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 49 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111251

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 56 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119424

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 38 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119418

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109505

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117210

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 55 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107092

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 64 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-10-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107110

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality standard for Nitrate as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325916

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2021-06-02 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325918

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-17 (Old Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2018-05-17 and 2022-04-08

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325919

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-22 (Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-06-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325921

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325923

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-7 (Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-14 and 2021-07-22

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325926

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-26 (Berry Creek upstream of Category I riparian creation on parcel 108-070-09).

Temporal Representation:

The samples were collected between the dates of 2017-11-20 and 2018-06-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325928

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-19 (Davis Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-21 and 2022-07-16

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161365, Nitrogen, Nitrate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325929

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Nitrate as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-21 (Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-06-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	161446	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Nitrogen, Nitrite
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326024

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-21 (Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-06-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119200

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 64 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-10-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326029

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-18 (Old Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-16 and 2022-04-07

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326030

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-28 (Berry Creek downstream of parcel 108-060-02).

Temporal Representation:

The samples were collected between the dates of 2017-11-20 and 2018-05-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326032

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-25 (Davis Creek downstream of parcel 108-010-05).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326033

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-3 (Upper Haehl Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2022-05-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326034

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-16 (Old Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-10 and 2022-04-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326035

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-4 (Baechtel Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2017-06-07 and 2022-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326036

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-27 (Outlet Creek downstream of Davis Creek confluence).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326037

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-23 (Davis Creek upstream of parcel 108-070-08).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326038

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-1 (Upper Haehl Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2018-05-08 and 2022-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326039

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-9 (Mill Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2017-06-13 and 2022-06-01

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326041

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-12 (Upp Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2021-05-03 and 2021-05-03

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326044

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-5 (Baechtel Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2017-06-06 and 2022-07-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326048

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-6 (Baechtel Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-15 and 2021-07-21

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325963

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325964

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-21 (Davis Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-17 and 2022-07-14

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325967

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-22 (Berry Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-15 and 2022-04-06

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325968

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-7 (Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-14 and 2021-07-22

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325972

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-14 (Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2018-05-22 and 2022-08-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325974

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2019-07-16 and 2019-07-16

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325979

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2019-09-10 and 2019-09-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325981

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-13 (Upp Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-05 and 2021-05-03

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325983

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-8 (Mill Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-13 and 2022-06-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325984

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-17 (Old Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2018-05-17 and 2022-04-08

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43134

Pollutant:

Nitrite as Nitrite NO2

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

44008

Pollutant:

Nitrite as Nitrite NO2

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Outlet Creek - 111PS0008 ]

Temporal Representation:

Data was collected over the time period 9/9/2008-9/29/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113489

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109517

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109749

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116400

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106222

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 54 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119804

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 55 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106223

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 56 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105491

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 57 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102567

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 38 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325985

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-22 (Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-06-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325987

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-11 (Upp Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-12 and 2021-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325991

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-24 (Davis Creek downstream of parcel 108-060-01).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325992

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-20 (Davis Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2018-05-18 and 2022-07-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325995

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-19 (Davis Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-21 and 2022-07-16

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325998

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-24 (Berry Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2018-05-14 and 2022-04-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326005

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-18 (Outlet Creek downstream of parcel 108-030-05).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-08-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326006

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326007

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-19 (Outlet Creek downstream of parcel 108-020-04).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-06-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326008

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2021-06-02 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326009

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-10 (Mill Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2017-06-08 and 2022-06-01

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326010

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-26 (Berry Creek upstream of Category I riparian creation on parcel 108-070-09).

Temporal Representation:

The samples were collected between the dates of 2017-11-20 and 2018-06-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326013

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-10-29 and 2018-10-29

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326016

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrite as N.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: BA-15 (Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2022-08-11 and 2022-08-11

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105493

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105484

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114353

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 49 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-06-18

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102700

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 46 samples exceeded the water quality standard for Nitrite as N.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2014-05-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 161446, Nitrogen, Nitrite	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326025

Pollutant:

Nitrogen, Nitrite

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	165909	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Oxadiazon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109533 has been replaced by LOE 350246 due to a reassessment of data using the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic) threshold. LOE 109535 has been replaced by LOE 350255 due to a reassessment of data using the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic) threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165909, Oxadiazon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122713

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxadiazon, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165909, Oxadiazon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122714

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxadiazon, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165909, Oxadiazon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350246

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165909, Oxadiazon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350255

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Oxadiazon is the USEPA Aquatic Life Benchmark of 0.88 ug/L for a fish (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165909, Oxadiazon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109534

Pollutant:

Oxadiazon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Oxdiazon, calculated using the IRIS Reference Dose, is 35 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.005 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165910	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Oxamyl (Vydate)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165910, Oxamyl (Vydate)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109536

Pollutant:

Oxamyl (Vydate)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for Oxamyl incorporated by reference in the Water Quality Control Plan, North Coast Basin is 50 ug/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165911	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Oxychlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165911, Oxychlordane	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122726

Pollutant:

Oxychlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxychlordane, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165911, Oxychlordane	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122715

Pollutant:

Oxychlordane

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Oxychlordane, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	72754	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	PCBs (Polychlorinated biphenyls)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective for the MUN beneficial use(s). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceed the objective for the MUN beneficial use(s) and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 72754, PCBs (Polychlorinated biphenyls)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109538

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of organisms only is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 72754, PCBs (Polychlorinated biphenyls)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109539

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The total PCB Congeners criterion for the protection of human health from consumption of water and organisms is 0.00017 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 72754, PCBs (Polychlorinated biphenyls)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

25465

Pollutant:

PCBs (Polychlorinated biphenyls)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

550

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 550 polychlorinated biphenyl (PCB) analytes collected in the upper mainstem Eel River exceed the evaluation guideline. Each of the 11 samples were analyzed for 50 PCB cogeners. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007, p. 3-4.00): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per the "Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Found in Drinking Water" (OEHHA 2007): The health-protective concentration of water-soluble PCBs in
drinking water associated with a one in one million extra lifetime cancer risk is 0.09 ug/L.

Guideline Reference:

Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Be Found in Drinking Water. Pesticide and Environmental Toxicology Branch, Office of Environmental Health Hazard Assessment, California Environmental Protection Agency

Spatial Representation:

Samples were collected from the Upper Mainstem Eel River at 2 locations as follows: (1) downstream of Van Arsdale Reservoir (SWAMP Station ID 111EELVAN), and (2) near Hearst (SWAMP Station ID 111EELHST). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

At the Van Arsdale site, samples were collected from February 2002 to April 2005. At the Hearst site, samples were collected from February 2002 to June 2002. Site visits corresponded to fall, winter, spring and early summer seasonal conditions.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165912	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Parathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165912, Parathion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119002

Pollutant:

Parathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Parathion, Ethyl. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (expressed as a 4 Day average) for parathion is 0.013 µg/L.

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165913	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Permethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109540 has been replaced by LOE 350300 due to a reassessment of data using the chronic criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165913, Permethrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350300

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Permethrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The chronic criterion for permethrin is 1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of permethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Water Quality Criteria Report for Permethrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165913, Permethrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350314

Pollutant:

Permethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Permethrin. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Permethrin

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	165914	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Phorate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165914, Phorate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122740

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phorate, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165914, Phorate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109543

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165914, Phorate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122739

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phorate, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165914, Phorate	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109542

Pollutant:

Phorate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165915	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Phosmet
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109544 has been replaced by LOE 350482 and LOE 109545 has been replaced by LOE 350427 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165915, Phosmet	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350482

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 165915, Phosmet	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122741

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Eighteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Eighteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165915, Phosmet	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122752

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Phosmet, Total. Two sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Two samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165915, Phosmet	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350427

Pollutant:

Phosmet

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165916	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Prometon (Prometone)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165916, Prometon (Prometone)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109547

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165916, Prometon (Prometone)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109546

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Prometon is the USEPA Aquatic Life Benchmark of 98 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165916, Prometon (Prometone)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122753

Pollutant:

Prometon (Prometone)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Prometon, Total. Fourteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Prometon (Prometone) is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 6/25/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165956	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Prometryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109548 has been replaced by LOE 350638 and LOE 109550 has been replaced by LOE 350590 due to a reassessment of data using the UC Davis Aquatic Life Criterion threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165956, Prometryn	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109549

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Prometryn, calculated using the IRIS Reference Dose, is 28 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.004 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165956, Prometryn	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350638

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Prometryn does not exceed 0.562 ug/L in the water column more than once every three years on average (Bower, et al. 2017).

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165956, Prometryn	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350590

Pollutant:

Prometryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality Criteria Report for Prometryn Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis.

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165957	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Propazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165957, Propazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109553

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for propazine is 100 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165957, Propazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109551

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165957, Propazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109554

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Propazine is the USEPA Aquatic Life Benchmark of 24.8 ug/L for a nonvascular plant (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165957, Propazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122754

Pollutant:

Propazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Propazine, Total. Seven sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Propazine is 0.1 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 6/25/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165958	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Pyrethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109555 has been replaced by LOE 350731 and LOE 109556 has been replaced by LOE 350738 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165958, Pyrethrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350731

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165958, Pyrethrin	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350738

Pollutant:

Pyrethrin

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrin is the USEPA Aquatic Life Benchmark of 0.04 ug/L for freshwater invertebrates (chronic) and is the sum of pyrethrin-1 and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	169783	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Pyrethrins
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 169783, Pyrethrins	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350827

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for pyrethrins is the USEPA Aquatic Life Benchmark of 0.04 ug/L for an invertebrate (chronic), and is the sum of cinerin-1, cinerin-2, jasmolin-1, jasmolin-2, pyrethrin-1, and pyrethrin-2.

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 169783, Pyrethrins	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350804

Pollutant:

Pyrethrins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .


DECISION ID	165959	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Pyrethroids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 109557 has been replaced by LOE 350904 and LOE 109558 has been replaced by LOE 350916 due to a reassessment of data using the chronic concentration goals threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165959, Pyrethroids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350904

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The summed ratios of the pyrethroid pesticides bifenthrin, cyfluthrin, cypermethrin, esfenvalerate, lambda-cyhalothrin, permethrin and their respective chronic concentration goals are not to exceed 1. If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.

Guideline Reference:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165959, Pyrethroids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350916

Pollutant:

Pyrethroids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the Control of Pyrethroid Pesticide Discharges

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008


DECISION ID	165960	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Secbumeton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165960, Secbumeton	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122566

Pollutant:

Secbumeton

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Secbumeton, Total. Seven samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 6/25/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157291	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Selenium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117173

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2012-12-17 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119407

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2012-12-17 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115793

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119146

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2012-12-17 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119169

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102668

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117193

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117189

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119173

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119166

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108486

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122567

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116278

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112900

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113012

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114452

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119850

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119147

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117191

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121131

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Selenium. Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The OEHHA Fish Contaminant Goal for selenium in fish tissue is 7.4 ppm. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A background dietary consumption rate of 0.114 mg/day is applied for this micronutrient. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109116

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119148

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2011-10-10 and 2011-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122569

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 20 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 2/4/2002-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111206

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107124

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112908

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106317

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105462

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122568

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Selenium, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117180

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326572

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326599

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326616

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326615

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326604

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326552

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Selenium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328968

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328990

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

328967

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111220

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2011-06-15 and 2011-06-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114418

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2010-10-24

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107074

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2010-10-28

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107061

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-12-02 and 2010-12-02

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109559

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119130

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2010-10-24

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107022

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2011-04-14

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119841

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2011-11-20 and 2011-11-20

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105538

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2010-10-24

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119846

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119862

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111263

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107149

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119860

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

109560

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119857

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111281

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114425

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119843

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107071

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117128

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105528

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117188

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117197

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119133

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107049

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119484

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117151

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117199

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107118

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119145

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107058

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114832

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43327

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106177

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2013-01-15 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107553

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111230

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2012-12-17 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107060

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2010-09-21

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117181

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2012-02-13 and 2012-02-13

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113003

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2011-04-14 and 2011-11-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119144

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-11-07 and 2010-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43388

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157291, Selenium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102660

Pollutant:

Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Selenium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2011-04-14 and 2012-02-29

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	157292	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Silver
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119566

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Toxics Rule (CTR) lists criterion maximum concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105475

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114360

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111252

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107129

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114371

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111233

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119832

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105019

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107031

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105517

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107094

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107032

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111255

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105510

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102698

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105476

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107131

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114358

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102568

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119824

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111657

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117835

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122581

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110964

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122583

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 20 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 2/4/2002-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105785

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107675

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103353

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111286

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107043

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43356

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107133

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106244

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119448

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122582

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Silver, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107052

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110955

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107034

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110959

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110957

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107146

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111270

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105505

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117983

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107083

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326633

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved silver criterion maximum concentration (CMC) to protect aquatic life in freshwater is hardnesss dependent. The criterion when calculated using a default hardness of 100 mg/L is 3.4 ug/L. This criterion was divided by 2 in order to better represent a CMC value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule, 2000.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326673

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326665

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Silver.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326630

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Silver.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112907

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119432

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119204

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114369

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119451

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110948

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105513

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102695

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102676

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119419

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107137

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102699

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119827

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113046

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107038

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103351

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116051

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110645

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

115826

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119852

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107122

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112950

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111264

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112919

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103352

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111259

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112949

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111223

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112938

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112932

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112912

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107018

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102663

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112909

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112913

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117141

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107099

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112940

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107014

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112928

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119826

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113065

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107152

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113057

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119206

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102608

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114373

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107021

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119812

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Silver. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

32863

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for silver.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion maximum concentrations (1-hour average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 111ER6140 (Eel River above Dos Rios).

Temporal Representation:

Samples collected between 11/13/2007 and 7/15/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157292, Silver	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117152

Pollutant:

Silver

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Silver.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	165961	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Simazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	LOE 105169 has been replaced by LOE 351052 and LOE 105171 has been replaced by LOE 350995 due to a reassessment of data using the USEPA Aquatic Life Benchmark threshold. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165961, Simazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

350995

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

Line of Evidence (LOE) for Decision ID 165961, Simazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

351052

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111BN0329 (Bucknell Creek above Eel River).

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Generic SWAMP QAPrP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

Line of Evidence (LOE) for Decision ID 165961, Simazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122584

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simazine, Total. Seven sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 6/25/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165961, Simazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105170

Pollutant:

Simazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165962	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Simetryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165962, Simetryn	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122596

Pollutant:

Simetryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Simetryn, Total. Seven sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. Seven samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 6/25/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	158443	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Sodium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 158443, Sodium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

329093

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Per the Drinking Water Standards and Health Advisories (USEPA 2012), the health advisory for sodium for individuals on a sodium-restricted diet is 20 mg/l.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 158443, Sodium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

329134

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	158444	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Strontium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 158444, Strontium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

329171

Pollutant:

Strontium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA Health Advisory for lifetime exposure to Stronitum as a drinking water level is a concentration of 4 mg/L

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle


DECISION ID	157293	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Sulfates
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional or other pollutants (Table 3.2 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326869

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-10-29 and 2021-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

329210

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326873

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sulfate.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2019-09-10 and 2021-08-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326874

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Sulfate.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2018-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326834

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-08-17 and 2017-09-13

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326820

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326803

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326899

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117712

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0160)

Temporal Representation:

The samples were collected between the dates of 2011-07-25 and 2011-07-25

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114798

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0001)

Temporal Representation:

The samples were collected between the dates of 2011-07-05 and 2011-07-05

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326893

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114326

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WE0816)

Temporal Representation:

The samples were collected between the dates of 2013-06-12 and 2013-06-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112426

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101940

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106935

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER003)

Temporal Representation:

The samples were collected between the dates of 2014-06-10 and 2014-06-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114921

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111CBCAER)

Temporal Representation:

The samples were collected between the dates of 2013-08-08 and 2013-08-08

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120136

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Sulfate.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0008)

Temporal Representation:

The samples were collected between the dates of 2011-07-06 and 2012-07-19

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114249

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111ERATRC)

Temporal Representation:

The samples were collected between the dates of 2012-10-10 and 2012-10-10

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105172

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104692

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111FS0007)

Temporal Representation:

The samples were collected between the dates of 2011-07-11 and 2011-07-11

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

116604

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

44054

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Outlet Creek - 111PS0008 ]

Temporal Representation:

Data was collected over the time period 9/9/2008-9/29/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

25536

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 41 sulfate samples collected in the upper mainstem Eel River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007, p. 3-3.00): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

33858

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the evaluation guideline.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2011): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Per 22 CCR 64449 (Table 64449-B): The recommended secondary maximum contaminant level for sulfate is 250 mg/L.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Samples were collected from the Eel River above Dos Rios station (111ER6140).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157293, Sulfates	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104714

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111PS0110)

Temporal Representation:

The samples were collected between the dates of 2014-06-09 and 2014-06-09

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165927	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Sulfotep
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165927, Sulfotep	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122597

Pollutant:

Sulfotep

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Sulfotep, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165927, Sulfotep	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122598

Pollutant:

Sulfotep

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Sulfotep, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165928	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Tedion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165928, Tedion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122609

Pollutant:

Tedion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tedion, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165928, Tedion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122610

Pollutant:

Tedion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tedion, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165929	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Terbufos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165929, Terbufos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122619

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Terbufos, Total. One sample result was not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Terbufos is 0.0004 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165929, Terbufos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119068

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Terbufos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165929, Terbufos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122611

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Terbufos, Total. Twenty-three sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

According to the 2006 USEPA Drinking Water Standards and Health Advisories, the Life-time Exposure Health Advisory for Terbufos is 0.0004 mg/L. (EPA 822-R-06-013, 2006)

Guideline Reference:

2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165929, Terbufos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106109

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Terbufos. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbufos is the USEPA Aquatic Life Benchmark of 0.03 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) 111BN0329).

Temporal Representation:

Date for this waterbody was collected over the date range 2013-08-27 to 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165929, Terbufos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105187

Pollutant:

Terbufos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA drinking water health advisory for terbufos is 0.4 µg/L.

Guideline Reference:

2012 Edition of the Drinking Water Standards and Health Advisories

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165930	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Terbuthylazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165930, Terbuthylazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105188

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165930, Terbuthylazine	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105189

Pollutant:

Terbuthylazine

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Terbuthylazine is the USEPA Aquatic Life Benchmark of 1800 ug/L for a fish (acute).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165931	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Terbutryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165931, Terbutryn	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105190

Pollutant:

Terbutryn

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Terbutryn, calculated using the IRIS Reference Dose, is 7 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.001 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):


DECISION ID	165932	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Tetrachlorvinphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165932, Tetrachlorvinphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122620

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tetrachlorvinphos, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165932, Tetrachlorvinphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105191

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The USEPA expected safe lifetime exposure limit in drinking water for Tetrachlorvinphos, calculated using the IRIS Reference Dose, is 210 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and 0.03 mg/kg/day as the reference dose.

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-10-15 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165932, Tetrachlorvinphos	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122621

Pollutant:

Tetrachlorvinphos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tetrachlorvinphos, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157294	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Thallium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112966

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114447

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102579

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112902

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107007

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106299

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114410

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102458

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119523

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102566

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112977

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119402

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106201

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119877

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113018

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107047

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119194

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105537

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106318

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102617

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102553

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114412

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106228

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113109

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114362

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119548

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119428

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117136

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112981

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113219

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119540

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114427

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119489

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119189

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102528

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112891

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119467

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119458

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106281

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102575

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113050

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111004

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106255

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106199

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106302

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119208

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105477

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106315

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114351

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102470

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119491

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102454

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102465

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106274

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114359

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102616

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102569

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102504

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114349

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119570

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119526

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102588

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113103

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119417

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117161

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119463

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119578

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107156

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107009

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113090

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102473

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102527

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102581

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119557

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106210

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119522

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102693

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 33 samples were collected, 33 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-28).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114383

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114330

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114405

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106212

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113052

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102632

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112989

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110980

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102684

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119492

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106182

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114388

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114424

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117205

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119875

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-18).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106303

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-21).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119512

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102589

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 39 samples were collected, 39 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-19).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-28 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119811

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102559

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119866

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 47 samples were collected, 47 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-24).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106206

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 46 samples were collected, 46 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-27).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102584

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119513

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113044

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102530

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 44 samples were collected, 44 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-25).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-20 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106252

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114355

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327069

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327074

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327075

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327072

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327076

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327071

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The Gold Book states that thallium chronic toxicity to one species of fish occurs at concentrations as low as 20 ug/L after 2,6000 hours of exposure.

Guideline Reference:

Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001.

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327073

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327070

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 20 samples were collected, 20 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106258

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-11).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119556

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107086

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Thallium criterion for the protection of human health from consumption of organisms only is 6.3 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111219

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-3).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102572

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-6).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110990

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-14).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102515

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 45 samples were collected, 45 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-23).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-09-21 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113038

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 40 samples were collected, 40 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-22).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106253

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-10).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112942

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-7).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113067

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 17 samples were collected, 17 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-9).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114364

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-5).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105470

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 35 samples were collected, 35 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-26).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102487

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 14 samples were collected, 14 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-17).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157294, Thallium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113039

Pollutant:

Thallium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Thallium. Although a total of 18 samples were collected, 18 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Maximum Contaminant Level for thallium incorporated by reference in the Water Quality Control Plan, North Coast Basin is 0.002 mg/L (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from 1 station(s) (Station Code(s) WQ-12).

Temporal Representation:

Date for this waterbody was collected over the date range 2010-10-24 to 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	165933	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Thiobencarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165933, Thiobencarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122633

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Thiobencarb, Total. Eighteen sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165933, Thiobencarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105194

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165933, Thiobencarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105193

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165933, Thiobencarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105192

Pollutant:

Thiobencarb

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for Thiobencarb is the USEPA Aquatic Life Benchmark of 1 ug/L for an invertebrate (chronic).

Guideline Reference:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 165933, Thiobencarb	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122634

Pollutant:

Thiobencarb/Bolero

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Thiobencarb, Total. Two sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165935	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Tokuthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165935, Tokuthion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122647

Pollutant:

Tokuthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tokuthion, Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165935, Tokuthion	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122635

Pollutant:

Tokuthion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Tokuthion, Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	103861	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. [Three lines of evidence are available in the administrative record to assess this pollutant. One of one samples exceed the objective for the COMM beneficial use(s). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one samples exceed the objective for the COMM beneficial use and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103861, Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121451

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD). Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

National Academy of Science guidelines (NAS 1972) establish a maximum total DDT concentration of 1000 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103861, Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121247

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD). Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite).

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103861, Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121476

Pollutant:

Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Fish fillet

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and the results are as follows 1 of the 1 samples exceeded the water quality standard for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD). Data were collected for 1 fish species (1 composite(s) of Chinook Salmon each composed of 5 fish per composite). Of these, 1 species (Chinook Salmon) exceeded the water quality standard.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The modified OEHHA Fish Contaminant Goal for total DDT in fish tissue is 15 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets. (Klasing, S., and R. Brodberg, 2008)

Guideline Reference:

Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene

Spatial Representation:

Data was collected from 1 station(s) with the station code(s): 111EELFCS.

Temporal Representation:

Data for this line of evidence were collected between 2011-12-23 and 2011-12-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	103898	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Toxicity
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. One of three samples exceed the objective for the COLD beneficial use and one of three samples exceed the objective for the WARM beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of three samples exceed the objective for the COLD beneficial use and one of three samples exceed the objective for the WARM beneficial use and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 103898, Toxicity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120966

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

1 of the 3 samples collected by SWAMP RWB1 Monitoring for Eel River HU, Upper Main HA (Includes Tomki Creek) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Ceriodaphnia dubia, for Young/female, Ceriodaphnia dubia, for Survival

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Water Board(NCRWQCB 2018).

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 stations. Monitoring site(s): ( 111BN0329 )

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103898, Toxicity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120983

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

0 of the 1 samples collected by SWAMP RWB1 Monitoring for Eel River HU, Upper Main HA (Includes Tomki Creek) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Growth (wt/surv indiv), Hyalella azteca, for Survival

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 stations. Monitoring site(s): ( 111BN0329 )

Temporal Representation:

The samples were collected between the dates of 2013-11-07 and 2013-11-07.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103898, Toxicity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120998

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Sediment

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 stations. Monitoring site(s): ( 111BN0329 )

Temporal Representation:

The samples were collected between the dates of 2013-11-07 and 2013-11-07.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 103898, Toxicity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120965

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 stations. Monitoring site(s): ( 111BN0329 )

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12.

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165936	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Trichlorfon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165936, Trichlorfon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122648

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Trichlorfon, Total. Eighteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165936, Trichlorfon	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122649

Pollutant:

Trichlorfon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Trichlorfon, Total. Two samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	157297	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Vanadium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Eighty-six lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. For the DISSOLVED fraction of WATER, AG beneficial use, 0 of 459 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. For the DISSOLVED fraction of WATER, MUN beneficial use, 0 of 450 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. For the TOTAL fraction of WATER, AG beneficial use, 0 of 458 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. For the TOTAL fraction of WATER, MUN beneficial use, 4 of 458 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114350

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106198

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114348

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119411

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107121

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105478

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107045

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102539

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117184

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106200

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119446

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106233

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327365

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Vanadium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327367

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Vanadium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327364

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Vanadium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327366

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Vanadium.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

329423

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

329412

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site: USGS-11471500 (EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA).

Temporal Representation:

The samples were collected between the dates of 2018-06-04 and 2018-06-04

Environmental Conditions:

QAPP Information:

QAPP not required for USGS projects

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102483

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119501

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111024

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114431

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113206

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119562

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107126

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119497

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113216

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102505

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102603

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102594

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112901

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113056

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119851

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119453

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119199

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119440

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114342

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119397

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119457

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113078

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105503

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102592

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119551

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113218

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119543

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113010

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119494

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119576

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119519

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111012

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113026

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102586

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111222

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113073

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105498

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113193

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102506

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119488

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119582

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119514

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102482

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The 0.1 mg/L criteria is for the recommended maximum concentrations of vanadium in irrigation water

Guideline Reference:

Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102525

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111015

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113029

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113083

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107120

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113212

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102597

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113021

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119192

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119436

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113068

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106220

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107030

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119456

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107044

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107127

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119461

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 13 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114374

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 13 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114372

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119454

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119422

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111009

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112994

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102537

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157297, Vanadium	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119547

Pollutant:

Vanadium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Vanadium.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Drinking Water Notification and Response Levels: An Overview

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	157296	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Zinc
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One hundred three lines of evidence are available in the administrative record to assess this pollutant. Zero samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. For the DISSOLVED fraction, COLD beneficial use, 0 of 558 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. For the DISSOLVED fraction, MUN beneficial use, 0 of 459 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. For the DISSOLVED fraction, WARM beneficial use, 0 of 558 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. For the TOTAL fraction, COLD beneficial use, 0 of 4 samples exceed the objective and this is insufficient data to apply Table 3.1 of the Listing Policy. For the TOTAL fraction, MUN beneficial use, 0 of 507 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. For SEDIMENT fraction, COLD beneficial use, 0 of 1 sample exceeds the objective and this is insufficient data to apply Table 3.1 of the Listing Policy. For SEDIMENT fraction, WARM beneficial use, 0 of 1 sample exceed the objective and this is insufficient data to apply Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114754

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114396

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102655

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113194

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112036

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

104069

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120102

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117134

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107026

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121696

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc in 459 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

121793

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Sediment

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for zinc in 459 mg/Kg dry weight (MacDonald et al. 2000a)

Guideline Reference:

Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31

Spatial Representation:

Data were collected from 1 station(s). Station Code(s): 111BN0329.

Temporal Representation:

Data for this waterbody were collected over the date range 2013-11-07 to 2013-11-07

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

32864

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the hardness based criteria calculated for zinc.

Data Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples collected at station 111ER6140 (Eel River above Dos Rios).

Temporal Representation:

Samples collected between 11/13/2007 and 7/15/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102531

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113203

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119534

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111244

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107097

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122662

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)1 to determine beneficial use support and results are as follows: 0 of 23 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)1 was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 3/23/2001-11/14/2006.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112946

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119579

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105464

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107148

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

103805

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102532

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111242

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107144

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122660

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)3 to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)3 was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected over the time period 2/7/2002-6/24/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110509

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102538

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43271

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119425

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113017

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120069

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122661

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek)2 to determine beneficial use support and results are as follows: 0 of 14 samples exceed the criterion for Zinc, Total. This LOE re-assesses data from LOE 21523 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek)2 was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107145

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111243

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119507

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111250

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119423

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327436

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327450

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327434

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 16 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327410

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for Zinc.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-20 (Old Outlet Creek downstream of parcel 108-030-04).

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113096

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113035

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107114

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106285

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107027

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119163

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113204

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102642

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114394

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102492

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105596

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111HSCAER)

Temporal Representation:

The samples were collected between the dates of 2011-07-26 and 2011-07-26

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

120091

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111TGCAER)

Temporal Representation:

The samples were collected between the dates of 2012-07-24 and 2012-07-24

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114409

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114442

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106180

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

107075

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 41 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

113098

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102637

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119478

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102486

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

108016

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111WER008)

Temporal Representation:

The samples were collected between the dates of 2012-07-23 and 2012-07-23

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114432

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105456

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102645

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102629

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112034

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111022

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117138

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112992

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119806

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119395

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119442

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-17)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114395

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-10)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102555

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-11)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106262

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112929

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114441

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-27)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

112035

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-08-27

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106313

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102498

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-19)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119137

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 33 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117163

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114407

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-14)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

110991

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 35 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-18)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

114434

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119530

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-21)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102524

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-7)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111215

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-3)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

111027

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-5)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119134

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 29 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-22)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117170

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 26 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106185

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-28 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117167

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 39 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-25)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

106287

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 40 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-23)

Temporal Representation:

The samples were collected between the dates of 2010-09-21 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105536

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-12)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102522

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-6)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117177

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 28 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-28)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

119141

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 42 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-24)

Temporal Representation:

The samples were collected between the dates of 2010-09-20 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

105458

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 17 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-9)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2012-12-17

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157296, Zinc	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

102644

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 30 samples exceeded the water quality standard for Zinc.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for Willits Bypass Monitoring and Reporting Program .

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (WQ-26)

Temporal Representation:

The samples were collected between the dates of 2010-10-24 and 2013-01-15

Environmental Conditions:

QAPP Information:

Quality Assurance Project Plan for Willits Bypass Project – Surface Water Quality Monitoring

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	104057	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	alpha-Endosulfan (Endosulfan 1)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Three line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 104057, alpha-Endosulfan (Endosulfan 1)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117653

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104057, alpha-Endosulfan (Endosulfan 1)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117656

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 104057, alpha-Endosulfan (Endosulfan 1)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117654

Pollutant:

alpha-Endosulfan (Endosulfan 1)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for alpha-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	104027	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	alpha.-BHC (Benzenehexachloride or alpha-HCH)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 104027, alpha.-BHC (Benzenehexachloride or alpha-HCH)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122592

Pollutant:

alpha.-BHC (Benzenehexachloride or alpha-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for HCH, alpha-, Total. Thirty-five sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 104027, alpha.-BHC (Benzenehexachloride or alpha-HCH)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122602

Pollutant:

alpha.-BHC (Benzenehexachloride or alpha-HCH)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for HCH, alpha-, Total. Four sample results were not used in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Objective/Criterion Reference:

Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165937	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	beta-Endosulfan (Endosulfan 2)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165937, beta-Endosulfan (Endosulfan 2)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117659

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165937, beta-Endosulfan (Endosulfan 2)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117657

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 165937, beta-Endosulfan (Endosulfan 2)	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

117658

Pollutant:

beta-Endosulfan (Endosulfan 2)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (111BN0329)

Temporal Representation:

The samples were collected between the dates of 2013-08-27 and 2013-12-12

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	165938	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	cis-Nonachlor
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165938, cis-Nonachlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122681

Pollutant:

cis-Nonachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Nonachlor, cis-, Total. Two samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165938, cis-Nonachlor	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122680

Pollutant:

cis-Nonachlor

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Nonachlor, cis-, Total. Eighteen samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	165939	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	p,p'-DDMU
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 165939, p,p'-DDMU	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122727

Pollutant:

p,p'-DDMU

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDMU(p,p'), Total. Nine samples were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River d/s Van Arsdale Reservoir - 111ER7910]

Temporal Representation:

Data was collected over the time period 2/6/2002-4/21/2005.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 165939, p,p'-DDMU	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

122728

Pollutant:

p,p'-DDMU

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

State Water Board staff re-assessed SWAMP data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for DDMU(p,p'), Total. One sample were removed from assessment because an appropriate evaluation guideline for the water body-pollutant combination could not be obtained for this listing cycle. This LOE re-assesses data from LOE 29807 from the 2010 Integrated Report. Data were re-assessed in order to evaluate these data in their own LOE, instead of being evaluated in the same LOE as other pesticide data.

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River near Hearst - 111ER7314]

Temporal Representation:

Data was collected on a single day 2/7/2002.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)


DECISION ID	155298	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Forty-eight lines of evidence are available in the administrative record to assess this pollutant. Nineteen of the 393 samples exceed the Objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Nineteen of 393 samples exceeded the OBJECTIVE/GUIDELINE/CRITERIA and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317916

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that 0 samples were below pH 6.5 and 1 sample was above pH 8.5, so that 1 of 5 samples exceeded the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The pH shall conform to the values listed in Table 3-1 which states that the water quality objective for pH shall not be depressed below 6.5 or raised above 8.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Blue Slides Creek above Bear Cr.; station code: 111FS0008.

Temporal Representation:

These samples were collected from 6/1/2016-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317847

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 6 samples were less than pH 6.5 and 0 of 6 samples were greater than 8.5, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, upper; station code: BA-4

Temporal Representation:

These samples were collected from 4/22/2011-7/13/2023

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317975

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 samples were less than pH 6.5 and 0 samples were greater than pH 8.5, so that 0 of 24 samples exceed the water quality objective for pH.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-010-06; station code: WQ-25.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317980

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 1 sample is less than pH 6.5 and 0 samples are greater than pH 8.5, so that 1 of 22 samples exceed the water quality objective for pH.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-060-01; station code: WQ-24.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318323

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for Willits Bypass Monitoring and Report Program and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, middle; station code: BA-9.

Temporal Representation:

These samples were collected from 4/24/2011-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318319

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for Willits Bypass Monitoring and Reporting Program and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, downstream; station code: BA-10.

Temporal Representation:

These samples were collected from 4/24/2011-5/31/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318327

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, upstream; station code: BA-8.

Temporal Representation:

These samples were collected from 4/21/2011-6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317870

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that 0 samples were less than pH 6.5 and 0 samples were greater than 8.5, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: Bear Creek below FS road 17NO2; station code: 111CE0551

Temporal Representation:

This sample was collected on 5/27/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

33914

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Neither of the 2 samples collected exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the lower limit pH for surface water bodies for this water body is 6.5, and the upper limit pH is 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Outlet Creek station (111PS0008).

Temporal Representation:

Two samples were collected in September 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100808

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for pH. Data range from 10.8.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.4mi above Trout Cr.
(111ERATRC)

Temporal Representation:

The samples were collected between the dates 10/10/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318371

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for Willits Bypass Monitoring and Reporting Program and determined that 0 samples are are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, upstream; station code: BA-16.

Temporal Representation:

These samples were collected from 4/4/2011-4/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318378

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek downstream of Davis Creek confluence; station code: WQ-27.

Temporal Representation:

These samples were collected from 10/19/2017-7/16/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318383

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at samplilng station name: Outlet Creek downstream of parcel 108-020-04; station code: WQ-19.

Temporal Representation:

These samples were collected from 10/20/2017-7/13/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318386

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Outlet Creek downstream of parcel 108-030-05; station code: WQ-18.

Temporal Representation:

These samples were collected from 10/18/2017-8/21/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317895

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 samples were less than pH 6.5 and 0 samples were greater than 8.5, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station: Berry Creek, upstream; station ID: BA-23

Temporal Representation:

These samples were collected on 4/13/2011, 7/10/2011, 5/15/2018, and 4/6/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318389

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, downstream; station code: BA-15.

Temporal Representation:

These samples were collected from 4/10/2011-8/11/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318393

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, middle; station code: BA-14.

Temporal Representation:

These samples were collected from 4/11/2011-8/12/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318670

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for SWAMP Reference Condition Management Plan and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Trout Creek ~0.2mi above Eel River; station code: 111TTCAER

Temporal Representation:

This sample was collected on 6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318397

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, upstream; station code: BA-7.

Temporal Representation:

These samples were collected from 4/23/2011-7/22/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318674

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, downstream; station code: BA-13.

Temporal Representation:

These samples were collected from 4/5/2011-5/2/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318678

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, middle; station code: BA-12.

Temporal Representation:

These samples were collected from 4/5/2011-5/3/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318682

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Upp Creek, upstream; station code: BA-11.

Temporal Representation:

These samples were collected from 4/8/2011-5/4/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318781

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for Adventure Scientists (Volunteer)* and determined that 0 samples are less than pH 6.5 and 1 sample is greater than pH 8.5, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.63.123.34; station code: ADVENTURESCIENTISTS-39.63.123.34.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317843

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 6 samples was less than pH 6.5 and 0 of 6 samples were greater than 8.5, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, middle; station code: BA-5

Temporal Representation:

These samples were collected from 7/21/2011-7/12/2022

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317891

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sample station name: Berry Creek, downstream; station code: BA-24.

Temporal Representation:

These samples were collected on 4/12/2011, 5/14/2018, and 7/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318353

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area; station code: WQ-21.

Temporal Representation:

These samples were collected from 11/9/2017-7/2/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318358

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area; station code: WQ-22.

Temporal Representation:

These samples were collected from 11/9/2017-6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318686

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, downstream; station code: BA-3.

Temporal Representation:

These samples were collected from 4/7/2011-5/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318690

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Upper Haehl Creek, middle; station code: BA-2.

Temporal Representation:

This sample was collected on 4/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318694

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, upper; station code: BA-1.

Temporal Representation:

These samples were collected from 4/6/2011-5/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318777

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed pH data for Adventure Scientists (Volunteer)* and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.49.123.23; station code: ADVENTURESCIENTISTS-39.49.123.23.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318773

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.38.123.1; station code: ADVENTURESCIENTISTS-39.38.123.1.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318363

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, downstream; station code: BA-18.

Temporal Representation:

These samples were collected from 5/24/2011-4/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318367

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, middle; station code: BA-17.

Temporal Representation:

These samples were collected from 4/26/2011-4/8/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317990

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 samples are less than pH 6.5 and 1 sample is greater than pH 8.5, so that 1 of 6 samples exceed the water quality objective for pH.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Davis Creek, downstream; station code: BA-21.

Temporal Representation:

These samples were collected from 5/24/2011-7/14/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317994

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 6 samples exceed the water quality objective for pH.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, middle; station code: BA-20.

Temporal Representation:

These samples were collected from 4/25/2011-7/15/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317998

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, upstream; station code: BA-19.

Temporal Representation:

These samples were collected from 4/9/2011-7/16/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318078

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data and determined that 0 samples were less than pH 6.5 and 1 sample was greater than pH 8.5, so that 1 of 1 sample exceeds the water quality objective for pH.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Garcia Creek above Bear Pen Cr.; station code: 111GCABPC

Temporal Representation:

This sample was collected on 7/24/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317960

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data for parent project SWAMP Reference Condition Management Plan and determined that 0 samples are less than pH 6.5 and 1 sample is greater than pH 8.5, so that 1 of 1 sample exceeds the water quality objective for pH.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Copper Butte Creek ~0.5mi above Eel River; station code: 111WER159

Temporal Representation:

This sample was collected on 11/6/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318021

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for the parent project SWAMP RWB1 Monitoring and determined that 0 samples were less than pH 6.5 and 2 samples were greater then pH 8.5, so that 2 of 8 samples exceeded the water quality objective for pH.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Dos Rios; station code: 111ER6140.

Temporal Representation:

These samples were collected from 6/7/2018-8/2/2019

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318025

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project SWAMP RWB1 Monitoring and determined that 0 samples were less than pH 6.5 and 5 of 8 samples exceed pH pH 8.5, so that 5 of 8 samples exceed the water quality objective for pH.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Outlet Creek; station code: 111ER6381.

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317969

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data from parent project SWAMP Reference Condition Management Plan and determined that 0 samples were less than pH 6.5 and 0 samples were greater than pH 8.5, so that 0 of 6 samples exceed the water quality objective for pH.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Corbin Creek ~0.1mi above NF; station code: 111CBCANI

Temporal Representation:

These samples were collected from 6/2/2016-6/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318033

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project SWAMP RWB1 Monitoring and determined that 0 samples were less than pH 6.5 and 4 samples were greater than pH 8.5, so that 4 of 35 samples exceed the water quality objective for pH.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River at Trout Creek Campground; station code: 111ER8102

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016-8/14/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317886

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek upstream of Category 1 riparian creation on parcel 108-070-09; station code: WQ-26.

Temporal Representation:

These samples were collected from 11/16/2017-6/26/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317881

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek downstream of parcel 108-060-02; station code: WQ-28

Temporal Representation:

These samples were collected from 11/17/2017-6/5/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34184

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 4 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the lower limit pH for this water body is 6.5, and the upper limit pH for this water body is 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Eel River above Dos Rios station (111ER6140).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100800

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for pH. Data range from 7.7.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.75 miles above Wesley Ives Creek
(111WE0816)

Temporal Representation:

The samples were collected between the dates 06/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317839

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 1 of 6 samples was less than pH 6.5 and 0 of 6 samples were greater than 8.5, so that 1 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, downstream; station code: BA-6.

Temporal Representation:

These samples were collected from 4/23/2011-7/21/2022

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155298, pH	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317985

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 samples are less than pH 6.5 and 0 samples are greater than pH 8.5, so that 0 of 23 samples exceed the water quality objective for pH.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek upstream of parcel 108-070-08; station code: WQ-23.

Temporal Representation:

These samples were collected from 10/20/2017-7/19/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	157300	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Anatoxin-A
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Seven of nine samples exceed the Municipal & Domestic Supply beneficial use objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Seven of nine samples exceed the Municipal & Domestic Supply beneficial use objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Eel River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157300, Anatoxin-A	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323599

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Anatoxin-A.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-05-23 and 2017-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157300, Anatoxin-A	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

323585

Pollutant:

Anatoxin-A

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 7 of 9 samples exceeded the water quality threshold for Anatoxin-A.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-05-23 and 2017-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1


DECISION ID	169273	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Benthic Community Effects
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects. Thirty-two line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data are available in the administrative record to assess this indicator. One hundred and five of 161 benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. Additionally, there are associated pollutant impairments on the waterbody (including but not necessarily limited to dissolved oxygen, water temperature, sediment, and specific conductivity). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing Benthic Community Effects in this waterbody segment on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 105 of 161 benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. Therefore, this water body is exceeding the water quality threshold for the protection of the WARM and/or COLD beneficial use. 4. Pursuant to section 3.9 of the Listing Policy, the water segment has associated pollutant(s) samples that exceed water quality objectives. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318326

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 2 samples are less than the July-October minimum of 6.0 mg/L and 2 of 4 samples are less than the November-June minimum of 9.0 mg, so that 2 of 6 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for COLD beneficial use waters to be a daily minimum of 6.0 mg/L and a 7-day moving minimum average of 8.0 mg/L and dissolved oxygen concentration limits for SPWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, upstream; station code: BA-8.

Temporal Representation:

These samples were collected from 4/21/2011-6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318685

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 4 samples are less than the November-June minimum of 6.0 mg/L and 0 of 0 samples are less than the July-October minimum of 9.0 mg/L, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, downstream; station code: BA-3.

Temporal Representation:

These samples were collected from 4/7/2011-5/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318776

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Adventure Scientists (Volunteer)* and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 1 of 1 sample is less than the November-June minimum of 9.0 mg/L, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.49.123.23; station code: ADVENTURESCIENTISTS-39.49.123.23.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318377

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 5 of 9 samples are greater than the July-October minimum of 6.0 mg/L and 13 of 16 samples are less than the November-June minimum of 9.0 mg/L, so that 18 of 25 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek downstream of Davis Creek confluence; station code: WQ-27.

Temporal Representation:

These samples were collected from 10/19/2017-7/16/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318673

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 2 of 4 samples are less than the November-June minimum of 9.0 mg/L, so that 2 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, downstream; station code: BA-13.

Temporal Representation:

These samples were collected from 4/5/2011-5/2/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34106

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 4 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The site specific objective for the Eel River HU is a minimum value of 7.0 mg/L. In addition, the 90% lower limit for this pollutant is 7.5 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. Lastly, the site specific objective of 50% lower limit of 10 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Eel River above Dos Rios station (111ER6140).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101086

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for dissolved oxygen. Data range from 18.2 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.75 miles above Wesley Ives Creek (111WE0816).

Temporal Representation:

The samples were collected between the dates of 6/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101062

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.4mi above Trout Cr. (111ERATRC).

Temporal Representation:

The samples were collected between the dates of 10/10/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101059

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for dissolved oxygen. Data range from 8.1 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 7/6/2011 - 7/19/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317838

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 3 samples exceed the dissolved oxygen water quality objective for July-October and 2 of 3 sample exceeds the dissolved oxygen water quality objective for November-June, so that 2 of 6 samples exceeded the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, downstream; station code: BA-6.

Temporal Representation:

These samples were collected from 5/16/2021-7/21/2021

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317915

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that 0 of 2 samples exceed the July-October water quality objective of 6 mg/L and 4 of 5 samples exceed the November-June water quality objective of 9 mg/L, so that 4 of 7 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Blue Slides Creek above Bear Cr.; station code: 111FS0008.

Temporal Representation:

These samples were collected from 6/1/2016-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317989

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 1 of 1 sample exceeds the July-October water quality objective of 6 mg/L and 3 of 5 samples exceed the November-June water quality objective of 9 mg/L, so that 4 of 6 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Davis Creek, downstream; station code: BA-21.

Temporal Representation:

These samples were collected from 5/24/2011-7/14/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318322

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Report Program and determined that 0 of 2 samples are less than the July-October minimum of 6.0 mg/L and 0 of 4 samples are less than the November-June minimum of 9.0 mg/L, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, middle; station code: BA-9.

Temporal Representation:

These samples were collected from 4/24/2011-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318689

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 0 of 1 sample is less than the November-June minimum of 9.0 mg/L, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Upper Haehl Creek, middle; station code: BA-2.

Temporal Representation:

This sample was collected on 4/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318669

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for SWAMP Reference Condition Management Plan and determined that 0 of 1 sample is less than the July-October minimum of 6.0 mg/L and 0 of 0 samples are less than the November-June minimum of 9.0 mg/L, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Trout Creek ~0.2mi above Eel River; station code: 111TTCAER

Temporal Representation:

This sample was collected on 6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100975

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Panther Creek ~2.6mi above Welch Cr. (111PS0160).

Temporal Representation:

The samples were collected between the dates of 7/25/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101065

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Thistle Glade Creek ~1mi above Eel River (111TGCAER).

Temporal Representation:

The samples were collected between the dates of 7/24/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317880

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the water quality objective of 6 mg/L from July-October and 3 of 16 samples exceed the water quality objective of 9 mg/L from November-June, so that 3 of 16 sample exceeds the dissolved oxygen water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek downstream of parcel 108-060-02; station code: WQ-28

Temporal Representation:

These samples were collected from 11/17/2017-6/5/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317979

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 2 of 3 samples exceed the July-October water quality objective of 6 mg/L and 11 of 17 samples exceed the November-June water quality objective of 9 mg/L, so that 13 of 20 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-060-01; station code: WQ-24.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318772

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Adventure Scientists (Volunteer)* and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 0 of 1 sample is less than the November-June minimum of 9.0 mg/L, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.38.123.1; station code: ADVENTURESCIENTISTS-39.38.123.1.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318366

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 1 sample was less than the July-October minimum of 6.0 mg/L and 2 of 3 samples were less than the November-June minimum of 9.0 mg/l, so that 2 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, middle; station code: BA-17.

Temporal Representation:

These samples were collected from 4/26/2011-4/8/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318385

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 5 of 11 samples are less than the July-October minimum of 6.0 mg/L and 7 of 18 are less than the November-June minimum of 9.0 mg/L, so that 12 of 29 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Outlet Creek downstream of parcel 108-030-05; station code: WQ-18.

Temporal Representation:

These samples were collected from 10/18/2017-8/21/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318396

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 2 of 3 samples are less than the July-October minimum of 6.0 mg/L and 1 of 3 samples are less than the November-June minimum of 9.0 mg/L, so that 3 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, upstream; station code: BA-7.

Temporal Representation:

These samples were collected from 4/23/2011-7/22/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101083

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 5/2/2012 - 6/7/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101341

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

If DO concentrations fall below the numeric objectives set forth by the Basin Plan (2018). If NO, then the waterbody is supporting that beneficial use, if YES, then that waterbody is considered impaired.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Dissolved oxygen (DO) concentrations shall conform to the numeric objectives expressed in section 3.3.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are present in the watershed (USEPA 2004). Rearing occurs year round and spawning/ incubation/ emergence occurs from November to June (Busby et al. 1996; CDFG 2004; Myers et al. 1998). Non-core rearing occurs in the mainstem Upper Main Eel River, while core rearing occurs in tributaries to the Upper Main.

Guideline Reference:

Status Review of West Coast Steelhead from Washington, Idaho, Oregon, and California

Guideline Reference:

Status Review of Chinook Salmon from Washington, Idaho, Oregon, and California.

Guideline Reference:

Recovery Strategy for California Coho Salmon: Report to the California Fish and Game Commission

Spatial Representation:

Information pertains to the Eel River HU, Upper Main HA (Includes Tomki Creek)

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101064

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rattlesnake Creek ~0.5mi above Eel River (111WER008).

Temporal Representation:

The samples were collected between the dates of 7/23/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317885

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the water quality objective of 6 mg/L from July-October and 5 of 18 samples exceed the water quality objective of 9 mg/L from November-June, so that 5 of 18 sample exceeds the dissolved oxygen water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek upstream of Category 1 riparian creation on parcel 108-070-09; station code: WQ-26.

Temporal Representation:

These samples were collected from 11/16/2017-6/26/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317890

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the water quality objective of 6 mg/L from July-October and 1 of 3 samples exceed the water quality objective of 9 mg/L from November-June, so that 1 of 3 sample exceeds the dissolved oxygen water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sample station name: Berry Creek, downstream; station code: BA-24.

Temporal Representation:

These samples were collected on 4/12/2011, 5/14/2018, and 7/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317842

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 2 of 3 samples exceed the dissolved oxygen water quality objective for July-October and 1 of 3 sample exceeds the dissolved oxygen water quality objective for November-June, so that 3 of 6 samples exceeded the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, middle; station code: BA-5

Temporal Representation:

These samples were collected from 7/21/2011-7/12/2022

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317984

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 3 of 7 samples exceed the July-October water quality objective of 6 mg/L and 2 of 16 samples exceed the November-June water quality objective of 9 mg/L, so that 5 of 23 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek upstream of parcel 108-070-08; station code: WQ-23.

Temporal Representation:

These samples were collected from 10/20/2017-7/19/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318020

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for the parent project SWAMP RWB1 Monitoring and determined that 0 of 0 samples exceed the July-October water quality objective of 6 mg/L and 1 of 2 samples exceed the November-June water quality objective of 9 mg/L, so that 1 of 2 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Dos Rios; station code: 111ER6140.

Temporal Representation:

These samples were collected from 6/7/2018-8/2/2019

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318318

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 2 samples are less than the July-October minimum of 6.0 mg/L and 2 of 4 samples are less than the November-June minimum of 9.0 mg/L, so that 2 of 6 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, downstream; station code: BA-10.

Temporal Representation:

These samples were collected from 4/24/2011-5/31/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318357

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 6 of 16 samples are less than the November-June minimum of 9.0 mg/L, so that 6 of 16 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area; station code: WQ-22.

Temporal Representation:

These samples were collected from 11/9/2017-6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318388

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 2 of 3 samples are less than the July-October minimum of 6.0 mg/L and 0 of 1 sample are less than the November-June minimum of 9.0 mg/L, so that 2 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, downstream; station code: BA-15.

Temporal Representation:

These samples were collected from 4/10/2011-8/11/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318677

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, middle; station code: BA-12.

Temporal Representation:

These samples were collected from 4/5/2011-5/3/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318681

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Upp Creek, upstream; station code: BA-11.

Temporal Representation:

These samples were collected from 4/8/2011-5/4/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101266

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 11/7/2103 - 12/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101060

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Cold Creek above Eel River (111FS0007).

Temporal Representation:

The samples were collected between the dates of 7/11/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317869

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that 0 of 0 sampled exceed the water quality objective of 6 mg/L from July-October and 0 of 1 sample exceeds the water quality objective of 9 mg/L from November-June, so that 0 of 1 sample exceeds the dissolved oxygen water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: Bear Creek below FS road 17NO2; station code: 111CE0551

Temporal Representation:

This sample was collected on 5/27/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317974

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 of 7 samples exceed the July-October water quality objective of 6 mg/L and 7 of 15 samples exceed the November-June water quality objective of 9 mg/L, so that 7 of 22 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-010-06; station code: WQ-25.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318382

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 4 of 6 samples are less than the July-October minimum of 6.0 mg/L and 4 of 16 are less than the November-June minimum of 9.0 mg/L, so that 8 of 22 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at samplilng station name: Outlet Creek downstream of parcel 108-020-04; station code: WQ-19.

Temporal Representation:

These samples were collected from 10/20/2017-7/13/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317846

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 1 of 3 samples exceed the dissolved oxygen water quality objective for July-October and 2 of 3 sample exceeds the dissolved oxygen water quality objective for November-June, so that 3 of 6 samples exceeded the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, upper; station code: BA-4

Temporal Representation:

These samples were collected from 4/22/2011-7/13/2023

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317968

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data from parent project SWAMP Reference Condition Management Plan and determined that 0 of 3 samples exceeded the July-October water quality objective of 6 mg/L and 0 of 3 samples exceeded the November-June water quality objective of 9 mg/L, so that 0 of 6 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Corbin Creek ~0.1mi above NF; station code: 111CBCANI

Temporal Representation:

These samples were collected from 6/2/2016-6/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318352

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 1 of 2 samples are less than the July-October minimum of 6.0 mg/L and 5 of 17 samples are less than the November-June minimum of 9.0 mg/L, so that 6 of 19 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area; station code: WQ-21.

Temporal Representation:

These samples were collected from 11/9/2017-7/2/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318370

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples were less than the July-October minimum of 6.0 mg/L and 3 of 3 samples were less than the November-June minimum of 9.0 mg/l, so that 3 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, upstream; station code: BA-16.

Temporal Representation:

These samples were collected from 4/4/2011-4/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318392

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 1 of 3 samples are less than the July-October minimum of 6.0 mg/L and 1 of 2 samples are less than the November-June minimum of 9.0 mg/L, so that 2 of 5 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, middle; station code: BA-14.

Temporal Representation:

These samples were collected from 4/11/2011-8/12/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101085

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for dissolved oxygen. Data range from 8.0 mg/L.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Trout Creek ~0.1mi above Eel River (111WER003).

Temporal Representation:

The samples were collected between the dates of 6/10/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101058

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bear Creek ~1.2mi above Blue Slides Cr. (111FS0001).

Temporal Representation:

The samples were collected between the dates of 7/5/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101228

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 11/7/2013 - 12/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317993

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 2 of 3 samples exceed the July-October water quality objective of 6 mg/L and 1 of 3 samples exceed the November-June water quality objective of 9 mg/L, so that 3 of 6 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, middle; station code: BA-20.

Temporal Representation:

These samples were collected from 4/25/2011-7/15/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317959

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data for parent project SWAMP Reference Condition Management Plan and determined that 0 of 0 samples exceed the July-October water quality objective of 6 mg/L and 0 of 1 sample exceeds the November-June water quality objective of 9 mg/L, so that 0 of 1 sample exceeds the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Copper Butte Creek ~0.5mi above Eel River; station code: 111WER159

Temporal Representation:

This sample was collected on 11/6/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318024

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project SWAMP RWB1 Monitoring and determined that 0 of 2 samples collected during July-October were less than the daily minimum of 6 mg/L and 1 of 6 samples collected during November-June was less than the daily minimum of 9 mg/L, so that 1 of 8 samples exceeds the water quality objective for dissolved oxygen.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Outlet Creek; station code: 111ER6381.

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318763

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for USGS California Water Science Center and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 0 of 1 sample is less than the November-June minimum of 9.0 mg/L, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA; site code: USGS-11471500.

Temporal Representation:

This sample was collected on 6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318362

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, downstream; station code: BA-18.

Temporal Representation:

These samples were collected from 5/24/2011-4/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101061

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s)Corbin Creek ~0.1mi abive Eel River (111CBCAER).

Temporal Representation:

The samples were collected between the dates of 8/8/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317894

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 1 of 1 sample exceeds the water quality objective of 6 mg/L from July-October and 2 of 3 samples exceed the water quality objective of 9 mg/L from November-June, so that 3 of 4 sample exceeds the dissolved oxygen water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station: Berry Creek, upstream; station ID: BA-22

Temporal Representation:

These samples were collected on 4/13/2011, 7/10/2011, 5/15/2018, and 4/6/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318693

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 2 of 3 samples are greater than the November-June minimum of 9.0 mg/L, so that 2 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, upper; station code: BA-1.

Temporal Representation:

These samples were collected from 4/6/2011-5/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

33874

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Two of the 2 samples collected exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for Outlet Creek is a minimum value of 7.0 mg/L. In addition, the 90% lower limit for this pollutant is 7.5 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. Lastly, the site specific objective of 50% lower limit of 10 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Outlet Creek station (111PS0008).

Temporal Representation:

Two samples were collected in September 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318780

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.63.123.34; station code: ADVENTURESCIENTISTS-39.63.123.34.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318778

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Adventure Scientists (Volunteer)* and determined that calendar year 2021 exceeds the 50% upper limit, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The 90% upper limit specific conductance objective at 77 F is 400 micromhos (or mS/cm2). The 50% upper limit specific conductance objective at 77 F is 200 micromhos (or mS/cm2). The 90% and 50% upper limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be less than or equal to the upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.49.123.23; station code: ADVENTURESCIENTISTS-39.49.123.23.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318683

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011, 2017, 2018, and 2021 do not exceed either the 90% or 50% upper limit, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Upp Creek, upstream; station code: BA-11.

Temporal Representation:

These samples were collected from 4/8/2011-5/4/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318034

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for parent project SWAMP RWB1 Monitoring and determined that calendar years 2016, 2017, 2018, and 2019 do not exceed the 90% or 50% upper limit, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The 90% upper limit specific conductance objective at 77 F is 375 micromhos (or mS/cm2). The 50% upper limit specific conductance objective at 77 F is 225 micromhos (or mS/cm2). The 90% and 50% upper limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be less than or equal to the upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River at Trout Creek Campground; station code: 111ER8102

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016-8/14/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318691

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar year 2011 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Upper Haehl Creek, middle; station code: BA-2.

Temporal Representation:

This sample was collected on 4/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318368

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011 and 2018 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar year 2022 exceeded the 50% upper limit of 200 micromhos, so that 1 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, middle; station code: BA-17.

Temporal Representation:

These samples were collected from 4/26/2011-4/8/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318390

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar year 2011 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar years 2018 and 2022 exceed the 50% upper limit of 200 micromhos, so that 2 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, downstream; station code: BA-15.

Temporal Representation:

These samples were collected from 4/10/2011-8/11/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318671

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for SWAMP Reference Condition Management Plan and determined that calendar year 2022 exceeds the 50% upper limit, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Trout Creek ~0.2mi above Eel River; station code: 111TTCAER

Temporal Representation:

This sample was collected on 6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317986

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 of 1 sample in 2017 and 0 of 1 sample in 2018 exceed the 90% upper limit of 400 micromhos and that 0 of 1 sample in 2017 and 0 of 1 sample in 2018 exceed the upper limit of 200 micromhos, so that 0 of 2 samples exceed the water quality objective for specific conductivity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek upstream of parcel 108-070-08; station code: WQ-23.

Temporal Representation:

These samples were collected from 10/20/2017-7/19/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317961

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data for parent project SWAMP Reference Condition Management Plan and determined that calendar year 2018 exceeds the 50% upper limit, so that 1 of 1 sample exceeds the water quality objective for specific conductivity.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Copper Butte Creek ~0.5mi above Eel River; station code: 111WER159

Temporal Representation:

This sample was collected on 11/6/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318324

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Report Program and determined that calendar years 2011, 2017, and 2022 did not exceed either the 90% upper limit of 400 micromhos or the 50% upper limit of 200 micromhos and that calendar year 2021 exceeded the 50% upper limit of 200 micromhos, so that 1 of 4 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, middle; station code: BA-9.

Temporal Representation:

These samples were collected from 4/24/2011-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318354

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2017 and 2018 did not exceed either the 90% upper limit of 400 micromhos or the 50% upper limit of 200 micromhos, so that 0 of 2 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area; station code: WQ-21.

Temporal Representation:

These samples were collected from 11/9/2017-7/2/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318687

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2017, 2018, and 2022 exceed both the 90% and 50% upper limits and calendar year 2011 does not exceed either upper limit, so that 3 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, downstream; station code: BA-3.

Temporal Representation:

These samples were collected from 4/7/2011-5/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318764

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for USGS California Water Science Center and determined that calendar year 2018 does not exceed either the 90% or 50% upper limit, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA; site code: USGS-11471500.

Temporal Representation:

This sample was collected on 6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318372

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar year 2011 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar years 2018 and 2022 exceeded the 50% upper limit of 200 micromhos, so that 2 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, upstream; station code: BA-16.

Temporal Representation:

These samples were collected from 4/4/2011-4/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318675

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011, 2017, and 2018 do not exceed either the 90% or 50% upper limit and calendar year 2021 exceeds the 50% upper limit, so that 1 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, downstream; station code: BA-13.

Temporal Representation:

These samples were collected from 4/5/2011-5/2/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317887

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that the samples do not exceed either the 90% upper limit of 400 micromhos or the 50% upper limit of 200 micromhos, so that 0 of the 18 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Per the Basin Plan (NCRWQCB 2007): The 90% upper limit specific conductance objective at 77 F is 285 micromhos (or mS/cm2). The 50% upper limit specific conductance objective at 77 F is 375 micromhos (or mS/cm2). The 90% and 50% upper limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be less than or equal to the upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek upstream of Category 1 riparian creation on parcel 108-070-09; station code: WQ-26.

Temporal Representation:

These samples were collected from 11/16/2017-6/26/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317892

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that calendar year 2011 does not exceed either the 90% or 50% upper limit and calendar years 2018 and 2022 exceed the 50% upper limit, so that 2 of the 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sample station name: Berry Creek, downstream; station code: BA-24.

Temporal Representation:

These samples were collected on 4/12/2011, 5/14/2018, and 7/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318695

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011, 2018, and 2022 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos, so that 0 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, upper; station code: BA-1.

Temporal Representation:

These samples were collected from 4/6/2011-5/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318379

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek downstream of Davis Creek confluence; station code: WQ-27.

Temporal Representation:

These samples were collected from 10/19/2017-7/16/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318782

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.63.123.34; station code: ADVENTURESCIENTISTS-39.63.123.34.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317917

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that calendar years 2016, 2017, 2020, 2021, and 2022 exceed the 50% upper limit and calendar year 2018 exceeds both the 90% and 50% upper limit, so that 6 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Blue Slides Creek above Bear Cr.; station code: 111FS0008.

Temporal Representation:

These samples were collected from 6/1/2016-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317991

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for parent project Willits Bypass Monitoring Program and determined that calendar years 2011 and 2018 do not exceed either the 90% or 50% upper limit and calendar year 2022 exceeds the 90% upper limit, so that 1 of 3 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Davis Creek, downstream; station code: BA-21.

Temporal Representation:

These samples were collected from 5/24/2011-7/14/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318320

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011, 2017, 2021, and 2022 did not exceed either the 90% upper limit of 400 micromhos or the 50% upper limit of 200 micromhos, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, downstream; station code: BA-10.

Temporal Representation:

These samples were collected from 4/24/2011-5/31/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318359

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area; station code: WQ-22.

Temporal Representation:

These samples were collected from 11/9/2017-6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318394

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011 and 2018 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar year 2022 exceed the 50% upper limit of 200 micromhos, so that 1 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, middle; station code: BA-14.

Temporal Representation:

These samples were collected from 4/11/2011-8/12/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318679

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, middle; station code: BA-12.

Temporal Representation:

These samples were collected from 4/5/2011-5/3/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317871

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that the 5/27/2015 sample does not exceed either the 90% or 50% upper limit, so that 0 of the 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: Bear Creek below FS road 17NO2; station code: 111CE0551

Temporal Representation:

This sample was collected on 5/27/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318328

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011, 2017, and 2022 did not exceed either the 90% upper limit of 400 micromhos or the 50% upper limit of 200 micromhos and calendar year 2011 exceeded the 50% upper limit of 200 micromhos, so that 1 of 4 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, upstream; station code: BA-8.

Temporal Representation:

These samples were collected from 4/21/2011-6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317844

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011 and 2017 do not exceed either the 90% or 50% upper limits and calendar years 2021 and 2022 exceed the 50% upper limit, so that 2 of the 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, middle; station code: BA-5

Temporal Representation:

These samples were collected from 7/21/2011-7/12/2022

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317896

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station: Berry Creek, upstream; station ID: BA-24

Temporal Representation:

These samples were collected on 4/13/2011, 7/10/2011, 5/15/2018, and 4/6/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317848

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that in 2011 0 of 2 samples, in 2017 0 of 2 samples, in 2021 0 of 1 sample, and in 2022 0 of 1 sample exceed the 90% upper limit of 400 micromhos and in 2011 0 of 2 samples, in 2017 0 of 2 samples, in 2021 1 of 1 sample , and in 2022 1 of 1 sample exceed the 50% upper limit of 200 micromhos, so that 2 of the 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, upper; station code: BA-4

Temporal Representation:

These samples were collected from 4/22/2011-7/13/2023

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317840

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011 and 2017 did not exceed either the 90% or 50% upper limit and calendar year 2021 exceeds both the 90% and 50% upper limits, so that 1 of the 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, downstream; station code: BA-6.

Temporal Representation:

These samples were collected from 4/23/2011-7/21/2021

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317995

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for parent project Willits Bypass Monitoring Program and determined that calendar years 2011, 2018, and 2022 do not exceed either the 90% or 50% upper limit, so that 0 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, middle; station code: BA-20.

Temporal Representation:

These samples were collected from 4/25/2011-7/15/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317999

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, upstream; station code: BA-19.

Temporal Representation:

These samples were collected from 4/9/2011-7/16/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352617

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-5 to determine beneficial use support and the results are as follows: 6 of 6 samples exceeded the water quality standard. CSCI scores were from 0.336962549 to 0.669698688 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rhen, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.)

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-5 (Baechtel Creek, middle).

Temporal Representation:

Samples were collected from 2011-04-22 to 2022-07-12.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352565

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 111CBCANF to determine beneficial use support and the results are as follows: 0 of 2 samples exceeded the water quality standard. CSCI scores were from 0.92165199414 to 1.024077117 .

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

Samples were collected from 2016-06-02 to 2018-07-10.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352616

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-4 to determine beneficial use support and the results are as follows: 6 of 6 samples exceeded the water quality standard. CSCI scores were from 0.2909749486 to 0.694179755 .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-4 (Baechtel Creek, upper).

Temporal Representation:

Samples were collected from 2011-04-22 to 2022-07-13.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352621

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-9 to determine beneficial use support and the results are as follows: 5 of 6 samples exceeded the water quality standard. CSCI scores were from 0.4524200253 to 0.83952008648 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-9 (Mill Creek, middle).

Temporal Representation:

Samples were collected from 2011-04-24 to 2022-06-01.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352606

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-16 to determine beneficial use support and the results are as follows: 3 of 3 samples exceeded the water quality standard. CSCI scores were from 0.38825804 to 0.40383210221 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-16 (Old Outlet Creek, upstream).

Temporal Representation:

Samples were collected from 2011-04-04 to 2022-04-04.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352610

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-2 to determine beneficial use support and the results are as follows: 1 of 1 samples exceeded the water quality standard. CSCI scores were from 0.613525673 to 0.613525673 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-2 (Upper Haehl Creek, middle).

Temporal Representation:

Samples were collected from 2011-04-06 to 2011-04-06.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317997

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 2 of 3 samples exceed the July-October water quality objective of 6 mg/L and 0 of 3 samples exceed the November-June water quality objective of 9 mg/L, so that 2 of 6 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, upstream; station code: BA-19.

Temporal Representation:

These samples were collected from 4/9/2011-7/16/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318032

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project SWAMP RWB1 Monitoring and determined that 0 of 18 samples collected during July-October were less than 6 mg/L and 0 of 14 samples collected during November-June were less than 9 mg/L, so that 0 of 32 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River at Trout Creek Campground; station code: 111ER8102

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016-8/14/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352615

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-3 to determine beneficial use support and the results are as follows: 4 of 4 samples exceeded the water quality standard. CSCI scores were from 0.32524653753 to 0.519872026 .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-3 (Upper Haehl Creek, downstream).

Temporal Representation:

Samples were collected from 2011-04-07 to 2022-05-05.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318022

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for the parent project SWAMP RWB1 Monitoring and determined that calendar year 2018 exceeds the 50% upper limit and calendar yaer 2019 does not exceed either the 90% or 50% upper limit, so that 1 of 2 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Dos Rios; station code: 111ER6140.

Temporal Representation:

These samples were collected from 6/7/2018-8/2/2019

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317976

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 samples in 2017 and 0 samples in 2018 exceed the 90% upper limit of 400 micromhos and that 0 samples in 2017 and 0 samples in 2018 exceed the 50% upper limit of 200 micromhos, so that 0 of 2 samples exceed the water quality objective for specific conductivity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-010-06; station code: WQ-25.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317970

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data from parent project SWAMP Reference Condition Management Plan and determined that calendar years 2018 and 2021 do not exceed either the 90% or 50% upper limit and calendar years 2016, 2017, 2019, and 2022 exceed the 50% upper limit, so that 4 of 6 samples exceed the water quality objective for specific conductivity.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Corbin Creek ~0.1mi above NF; station code: 111CBCANI

Temporal Representation:

These samples were collected from 6/2/2016-6/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317981

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-060-01; station code: WQ-24.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317882

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek downstream of parcel 108-060-02; station code: WQ-28

Temporal Representation:

These samples were collected from 11/17/2017-6/5/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318774

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.38.123.1; station code: ADVENTURESCIENTISTS-39.38.123.1.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318364

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, downstream; station code: BA-18.

Temporal Representation:

These samples were collected from 5/24/2011-4/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318398

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011 and 2018 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar year 2022 exceed the 50% upper limit of 200 micromhos, so that 1 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, upstream; station code: BA-7.

Temporal Representation:

These samples were collected from 4/23/2011-7/22/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318026

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for parent project SWAMP RWB1 Monitoring and determined that calendar year 2018 does not exceed either the 90% or 50% upper limit, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Outlet Creek; station code: 111ER6381.

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318373

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, upstream; station code: BA-16.

Temporal Representation:

These samples were collected from 4/4/2011-4/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318672

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Trout Creek ~0.2mi above Eel River; station code: 111TTCAER

Temporal Representation:

This sample was collected on 6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317845

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, middle; station code: BA-5

Temporal Representation:

These samples were collected from 7/21/2011-7/12/2022

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317996

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, middle; station code: BA-20.

Temporal Representation:

These samples were collected from 4/25/2011-7/15/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318765

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA; site code: USGS-11471500.

Temporal Representation:

This sample was collected on 6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318365

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, downstream; station code: BA-18.

Temporal Representation:

These samples were collected from 5/24/2011-4/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318391

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, downstream; station code: BA-15.

Temporal Representation:

These samples were collected from 4/10/2011-8/11/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317893

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the temperature water quality objective of 24 degrees C for July-October and 0 of 3 samples exceed the water quality objective of 20 degrees C for November-June, so that 0 of 3 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sample station name: Berry Creek, downstream; station code: BA-24.

Temporal Representation:

These samples were collected on 4/12/2011, 5/14/2018, and 7/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317992

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Davis Creek, downstream; station code: BA-21.

Temporal Representation:

These samples were collected from 5/24/2011-7/14/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318023

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Dos Rios; station code: 111ER6140.

Temporal Representation:

These samples were collected from 6/7/2018-8/2/2019

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318325

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, middle; station code: BA-9.

Temporal Representation:

These samples were collected from 4/24/2011-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318355

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area; station code: WQ-21.

Temporal Representation:

These samples were collected from 11/9/2017-7/2/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318684

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Upp Creek, upstream; station code: BA-11.

Temporal Representation:

These samples were collected from 4/8/2011-5/4/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318399

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 3 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 3 samples are greater than the November-June maximum of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, upstream; station code: BA-7.

Temporal Representation:

These samples were collected from 4/23/2011-7/22/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318035

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River at Trout Creek Campground; station code: 111ER8102

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016-8/14/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318027

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Outlet Creek; station code: 111ER6381.

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317918

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Blue Slides Creek above Bear Cr.; station code: 111FS0008.

Temporal Representation:

These samples were collected from 6/1/2016-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317971

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Corbin Creek ~0.1mi above NF; station code: 111CBCANI

Temporal Representation:

These samples were collected from 6/2/2016-6/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318692

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 0 of 1 sample is greater than the November-June maximum of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Upper Haehl Creek, middle; station code: BA-2.

Temporal Representation:

This sample was collected on 4/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318783

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Adventure Scientists (Volunteer)* and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 1 of 1 sample is greater than the November-June maximum of 20 degrees, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.63.123.34; station code: ADVENTURESCIENTISTS-39.63.123.34.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318779

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Adventure Scientists (Volunteer)* and determined that 0 of 0 samples are greater than the July-October maximum of 24 degrees Celcius and 1 of 1 sample is greater than the November-June maximum of 20 degrees, so that 1 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.49.123.23; station code: ADVENTURESCIENTISTS-39.49.123.23.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317841

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, downstream; station code: BA-6.

Temporal Representation:

These samples were collected from 4/23/2011-7/21/2021

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318000

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, upstream; station code: BA-19.

Temporal Representation:

These samples were collected from 4/9/2011-7/16/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317977

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-010-06; station code: WQ-25.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318321

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, downstream; station code: BA-10.

Temporal Representation:

These samples were collected from 4/24/2011-5/31/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318360

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area; station code: WQ-22.

Temporal Representation:

These samples were collected from 11/9/2017-6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318688

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, downstream; station code: BA-3.

Temporal Representation:

These samples were collected from 4/7/2011-5/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318696

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, upper; station code: BA-1.

Temporal Representation:

These samples were collected from 4/6/2011-5/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318329

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, upstream; station code: BA-8.

Temporal Representation:

These samples were collected from 4/21/2011-6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318079

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Garcia Creek above Bear Pen Cr.; station code: 111GCABPC

Temporal Representation:

This sample was collected on 7/24/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317897

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station: Berry Creek, upstream; station ID: BA-25

Temporal Representation:

These samples were collected on 4/13/2011, 7/10/2011, 5/15/2018, and 4/6/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317962

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Copper Butte Creek ~0.5mi above Eel River; station code: 111WER159

Temporal Representation:

This sample was collected on 11/6/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

WQX from the NWQMP for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318775

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.38.123.1; station code: ADVENTURESCIENTISTS-39.38.123.1.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318380

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek downstream of Davis Creek confluence; station code: WQ-27.

Temporal Representation:

These samples were collected from 10/19/2017-7/16/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318676

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed temperature data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the July-October maximum of 24 degrees Celcius and 0 of 4 samples exceed the November-June maximum of 20 degrees Celcius, so that 0 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, downstream; station code: BA-13.

Temporal Representation:

These samples were collected from 4/5/2011-5/2/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317849

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, upper; station code: BA-4

Temporal Representation:

These samples were collected from 4/22/2011-7/13/2023

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317888

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the temperature water quality objective of 24 degrees C for July-October and 18 of 18 samples exceed the water quality objective of 20 degrees C for November-June, so that 18 of 18 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek upstream of Category 1 riparian creation on parcel 108-070-09; station code: WQ-26.

Temporal Representation:

These samples were collected from 11/16/2017-6/26/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317872

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: Bear Creek below FS road 17NO2; station code: 111CE0551

Temporal Representation:

This sample was collected on 5/27/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317883

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek downstream of parcel 108-060-02; station code: WQ-28

Temporal Representation:

These samples were collected from 11/17/2017-6/5/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317982

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-060-01; station code: WQ-24.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317987

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek upstream of parcel 108-070-08; station code: WQ-23.

Temporal Representation:

These samples were collected from 10/20/2017-7/19/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318369

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, middle; station code: BA-17.

Temporal Representation:

These samples were collected from 4/26/2011-4/8/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318395

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, middle; station code: BA-14.

Temporal Representation:

These samples were collected from 4/11/2011-8/12/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318680

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, middle; station code: BA-12.

Temporal Representation:

These samples were collected from 4/5/2011-5/3/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352605

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-15 to determine beneficial use support and the results are as follows: 4 of 4 samples exceeded the water quality standard. CSCI scores were from 0.095365442422 to 0.518107208 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-15 (Outlet Creek, downstream).

Temporal Representation:

Samples were collected from 2011-04-10 to 2022-08-11.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352613

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-22 to determine beneficial use support and the results are as follows: 4 of 4 samples exceeded the water quality standard. CSCI scores were from 0.32548173983 to 0.58159426 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-22 (Berry Creek, upstream).

Temporal Representation:

Samples were collected from 2011-04-13 to 2022-04-06.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352618

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-6 to determine beneficial use support and the results are as follows: 6 of 6 samples exceeded the water quality standard. CSCI scores were from 0.13157274079 to 0.662580872 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-6 (Baechtel Creek, downstream).

Temporal Representation:

Samples were collected from 2011-04-23 to 2021-07-21.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352569

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 111FS0008 to determine beneficial use support and the results are as follows: 0 of 2 samples exceeded the water quality standard. CSCI scores were from 0.881066419 to 1.0880634462 .

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

Samples were collected from 2016-06-01 to 2018-07-09.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352611

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-20 to determine beneficial use support and the results are as follows: 6 of 6 samples exceeded the water quality standard. CSCI scores were from 0.24416350749 to 0.627896444 .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-20 (Davis Creek, middle).

Temporal Representation:

Samples were collected from 2011-04-25 to 2022-07-15.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352608

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-18 to determine beneficial use support and the results are as follows: 4 of 4 samples exceeded the water quality standard. CSCI scores were from 0.11664053412 to 0.29890787 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-18 (Old Outlet Creek, downstream).

Temporal Representation:

Samples were collected from 2011-05-24 to 2022-04-07.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352612

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-21 to determine beneficial use support and the results are as follows: 6 of 6 samples exceeded the water quality standard. CSCI scores were from 0.1411149762 to 0.263709529 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-21 (Davis Creek, downstream).

Temporal Representation:

Samples were collected from 2011-05-24 to 2022-07-14.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352571

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 111GCABPC to determine beneficial use support and the results are as follows: 0 of 1 samples exceeded the water quality standard. CSCI scores were from 0.958091915 to 0.958091915 .

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

Samples were collected from 2018-07-24 to 2018-07-24.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101084

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rice Creek ~0.5mi above Rice Fork (111PS0110).

Temporal Representation:

The samples were collected between the dates of 6/9/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101063

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Horse Creek above Eel River (111HSCAER).

Temporal Representation:

The samples were collected between the dates of 7/26/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352567

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 111CE0551 to determine beneficial use support and the results are as follows: 0 of 1 samples exceeded the water quality standard. CSCI scores were from 1.180763061 to 1.180763061 .

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

Samples were collected from 2015-05-27 to 2015-05-27.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352566

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 111CBCANF to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality standard. CSCI scores were from 0.85505350238 to 1.1062995057 .

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

Samples were collected from 2017-06-21 to 2021-08-02.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352601

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-11 to determine beneficial use support and the results are as follows: 4 of 4 samples exceeded the water quality standard. CSCI scores were from 0.63494736979 to 0.713868605 .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-11 (Upp Creek, upstream).

Temporal Representation:

Samples were collected from 2011-04-08 to 2021-05-04.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352607

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-17 to determine beneficial use support and the results are as follows: 4 of 4 samples exceeded the water quality standard. CSCI scores were from 0.26284029648 to 0.578345108 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-17 (Old Outlet Creek, middle).

Temporal Representation:

Samples were collected from 2011-04-26 to 2022-04-08.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352599

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-1 to determine beneficial use support and the results are as follows: 3 of 3 samples exceeded the water quality standard. CSCI scores were from 0.29450341381 to 0.549907558 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-1 (Upper Haehl Creek, upper).

Temporal Representation:

Samples were collected from 2011-04-06 to 2022-05-04.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352609

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-19 to determine beneficial use support and the results are as follows: 3 of 6 samples exceeded the water quality standard. CSCI scores were from 0.40316214442 to 0.871607002 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-19 (Davis Creek, upstream).

Temporal Representation:

Samples were collected from 2011-04-09 to 2022-07-16.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352603

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-13 to determine beneficial use support and the results are as follows: 4 of 4 samples exceeded the water quality standard. CSCI scores were from 0.29719024572 to 0.481852863 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-13 (Upp Creek, downstream).

Temporal Representation:

Samples were collected from 2011-04-05 to 2021-05-02.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352602

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-12 to determine beneficial use support and the results are as follows: 3 of 3 samples exceeded the water quality standard. CSCI scores were from 0.2068888063 to 0.622071068 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-12 (Upp Creek, middle).

Temporal Representation:

Samples were collected from 2011-04-05 to 2021-05-03.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352570

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 111FS0008 to determine beneficial use support and the results are as follows: 0 of 3 samples exceeded the water quality standard. CSCI scores were from 0.96796120346 to 1.06982166 .

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

Samples were collected from 2017-06-20 to 2021-06-02.

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352614

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-24 to determine beneficial use support and the results are as follows: 3 of 3 samples exceeded the water quality standard. CSCI scores were from 0.22746248374 to 0.515219757 .

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-24 (Berry Creek, downstream).

Temporal Representation:

Samples were collected from 2011-04-12 to 2022-04-05.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352600

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-10 to determine beneficial use support and the results are as follows: 6 of 6 samples exceeded the water quality standard. CSCI scores were from 0.29629846674 to 0.78039305802 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-10 (Mill Creek, downstream).

Temporal Representation:

Samples were collected from 2011-04-24 to 2022-05-31.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352620

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-8 to determine beneficial use support and the results are as follows: 6 of 6 samples exceeded the water quality standard. CSCI scores were from 0.2738326941 to 0.698142928 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-8 (Mill Creek, upstream).

Temporal Representation:

Samples were collected from 2011-04-21 to 2022-06-02.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101099

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 8/27/2013 - 10/15/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101018

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 5/2/2012 - 6/7/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101030

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 7/6/2011 - 7/19/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101032

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Corbin Creek ~0.1mi abive Eel River (111CBCAER).

Temporal Representation:

The samples were collected between the dates of 8/8/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

31521

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Recovery Strategy for California Coho Salmon: Report to the California Fish and Game Commission

Guideline Reference:

Status Review of Chinook Salmon from Washington, Idaho, Oregon, and California.

Guideline Reference:

Status Review of West Coast Steelhead from Washington, Idaho, Oregon, and California

Guideline Reference:

Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment

Spatial Representation:

Information pertains to the Eel River HU, Upper Main HA (Includes Tomki Creek)

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

133579

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 11/7/2013 - 12/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101023

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Trout Creek ~0.1mi above Eel River (111WER003).

Temporal Representation:

The samples were collected between the dates of 6/10/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101029

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bear Creek ~1.2mi above Blue Slides Cr. (111FS0001).

Temporal Representation:

The samples were collected between the dates of 7/5/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100995

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Panther Creek ~2.6mi above Welch Cr. (111PS0160).

Temporal Representation:

The samples were collected between the dates of 7/25/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101035

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Thistle Glade Creek ~1mi above Eel River (111TGCAER).

Temporal Representation:

The samples were collected between the dates of 7/24/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

96396

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

The site had a CSCI score(s) of 0.786075662, 0.701636017, 1.163189987, 0.944699596, 1.028890877, 1.051969251, 1.130959517, 1.110036092, 1.088632514, 1.036560778, 1.053819223, 1.021319221, 1.032229286, 1.216910053, 0.937793947, 0.883728734, 1.049542903.

The samples taken on 7/26/2011 average to 1.037569222.
The samples taken on 8/8/2013 average to 0.7438558395.

Therefore, only 1 out of the 17 samples exceeded the water quality objective and does not support the aquatic life beneficial use.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

These samples were collected at the following station: 111CBCAER

Temporal Representation:

These samples were collected on: 8/8/2013

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. QAPP for SWAMP Reference Condition Management Plan.

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

96753

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

The site had a CSCI score(s) of 0.921818, 0.93683, 0.9447, 0.945943, 0.984442, 0.985554, 0.993075, 1.016662, 1.028891, 1.032229, 1.036561, 1.051969, 1.053819, 1.063167, 1.088633
1.119634, 1.13096, 1.18668, 1.19127, 1.192803, 1.220624, 1.228622, 1.239888, 1.240843

Additionally, this water body passed several screening criteria and was identified as a reference water body for the purposes of developing the CSCI. Reference sites where human disturbance is absent or minimal are used to set benchmark expectations for healthy streams. A large set of nearly 600 reference sites representing the broad diversity of natural stream types found across California was used to develop the CSCI.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

These samples were collected at the following stations:
111CBCAER
111TGCAER
111ERATRC
111WE0816
111WER003
111FS0007
111WER003
111WER003
111FS0001
111PS0110
111FS0008
111FS0007
111HSCAER
111WER008
111FS0008
111TGCAER
111FS0008
111PS0110
111TGCAER
111WER159
111WER159
111WER159
111PS0160
111WER159

Temporal Representation:

These samples were collected on:
6/20/2001
9/20/2004
10/10/2012
6/12/2013
9/21/2004
6/21/2001
6/14/2001
9/21/2004
7/5/2011
6/9/2014
6/7/2012
7/11/2011
7/26/2011
8/7/2003
7/6/2011
9/12/2000
7/19/2012
6/24/2009
8/17/2010
6/29/2004
9/16/2009
8/3/2009
7/25/2011
6/24/2009

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. QAPP for SWAMP Reference Condition Management Plan.

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

32165

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Two of the two samples collected had an IBI score below 52.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

The Index of Biological Integrity (IBI) is a multi-metric assessment that employs biological metrics that respond to a habitat or water quality impairment. Each of the biological metrics measured at a site are converted to an IBI score then summed. These cumulative scores are then ranked. For the Northern California IBI, sites with scores below 52 are considered to have impaired conditions.

Guideline Reference:

Development of a Benthic Index of Biotic Integrity (B-IBI) for Wadeable Streams in Northern Coastal California and its Application to Regional 305(b) Assessment

Spatial Representation:

The samples were collected at Outlet Creek, station code 111PS0008.

Temporal Representation:

The samples were collected on September 9, 2008 and September 29, 2008.

Environmental Conditions:

QAPP Information:

The sample was collected for the SWAMP Perennial Streams Assessment.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

132725

Pollutant:

Habitat Assessment (Streams)

LOE Subgroup:

Ancillary Line of Evidence

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

HABITAT ASSESSMENT

Data Used to Assess Water Quality:

The site had IPI scores of 1.13, 1.05, 1.2, 0.99, 0.97, 0.91, 1.05, 1.11, 1.01, 1.02, 0.96, 1.02 and 1.09. Most of these scores indicate that the habitat is either Likely Intact or but one score shows it is Possibly Altered.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Physical characteristics of a site vary due to both natural factors and human disturbance. Statistical models based on a large statewide reference data set can help distinguish natural variability from anthropogenic stress. These models work across the diverse stream types found in California. The Index of Physical Habitat Integrity (IPI) is a multimetric Index developed based on these models to characterize physical habitat condition for streams in California. Index scores near 1 indicate physical habitat conditions similar to reference, whereas lower scores indicate degradation. For the purposes of making statewide assessments, three thresholds (analogous to those used for the CSCI) were established based on the 30th; 10th; and 1st percentiles of IPI scores at reference sites. These three thresholds divide the IPI scoring range into 4 categories of physical condition as follows: greater than or equal to 0.94 = likely intact condition; 0.93 to 0.84 = possibly altered condition; 0.83 to 0.71 = likely altered condition; less than or equal to 0.70 = very likely altered condition. Scores of 0.83 or lower indicate that the physical habitat has been altered and low CSCI scores from this site may be due to impacts to the physical habitat.

Guideline Reference:

An Index to Measure the Quality of Physical Habitat in California Wadeable Streams

Spatial Representation:

These samples were collected at the following stations:
111FS0001
111CE0551
111FS0008
111FS0007
111CBCAER
111ERATRC
111WE0816
111HSCAER
111PS0160
111PS0110
111TGCAER
111WER003

Temporal Representation:

These samples were collected on:
7/5/2011
5/27/2015
7/6/2011
7/19/2012
8/8/2013
10/10/2012
6/12/2013
7/26/2011
7/25/2011
6/9/2014
7/24/2012
6/10/2014

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. QAPP for SWAMP Reference Condition Management Plan.

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

4783

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unknown

Temporal Representation:

Unknown

Environmental Conditions:

Unknown

QAPP Information:

Unknown

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

4784

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unknown

Temporal Representation:

Unknown

Environmental Conditions:

Unknown

QAPP Information:

Unknown

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43970

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Outlet Creek - 111PS0008 ]

Temporal Representation:

Data was collected over the time period 9/9/2008-9/29/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

43225

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Eel River above Dos Rios - 111ER6140]

Temporal Representation:

Data was collected over the time period 11/13/2007-7/15/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

46803

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Information pertains to the Eel River HU, Upper Main HA (Includes Tomki Creek) water body.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101020

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.75 miles above Wesley Ives Creek (111WE0816).

Temporal Representation:

The samples were collected between the dates of 6/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101031

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Cold Creek above Eel River (111FS0007).

Temporal Representation:

The samples were collected between the dates of 7/11/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101034

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rattlesnake Creek ~0.5mi above Eel River (111WER008).

Temporal Representation:

The samples were collected between the dates of 7/23/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101022

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rice Creek ~0.5mi above Rice Fork (111PS0110).

Temporal Representation:

The samples were collected between the dates of 6/9/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101033

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.4mi above Trout Cr. (111ERATRC).

Temporal Representation:

The samples were collected between the dates of 10/10/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352619

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-7 to determine beneficial use support and the results are as follows: 6 of 6 samples exceeded the water quality standard. CSCI scores were from 0.3112152314 to 0.513882534 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-7 (Outlet Creek, upstream).

Temporal Representation:

Samples were collected from 2011-04-23 to 2021-07-22.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 169273, Benthic Community Effects	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

352604

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for BA-14 to determine beneficial use support and the results are as follows: 5 of 5 samples exceeded the water quality standard. CSCI scores were from 0.27659823362 to 0.560687299 .

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

The samples were collected at 1 monitoring site: BA-14 (Outlet Creek, middle).

Temporal Representation:

Samples were collected from 2011-04-11 to 2022-08-12.

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	161480	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Microcystins
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Two of 9 samples exceed the Municipal & Domestic Supply beneficial use objective, 0 of 9 samples exceed the Water Contact Recreation beneficial use objective, and 0 of 9 samples exceed the Wildlife Habitat beneficial use objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of 9 samples exceed the Municipal & Domestic Supply beneficial use objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Eel River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 161480, Microcystins	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325485

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

California Office of Environmental Health Hazard Assessment (OEHHA) established 2 ug/L of microcystins as the subchronic water concentration for dog intake/ingestion (Office of Environmental Health Hazard Assessment Public Health Action Level for microcystin and Human Recreational Uses (May 2012)). OEHHA Action Level for subchronic water intake, dog.

Guideline Reference:

Toxicological Summary and Suggested Action Levels to Reduce Potential Adverse Health Effects of Six Cyanotoxins

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-05-23 and 2017-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161480, Microcystins	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325546

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 9 samples exceeded the water quality threshold for Microcystins, Total.

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

USEPA 10-day microcystin health advisory for bottle-fed infants and young children of pre-school age is 0.3 ug/L.

Guideline Reference:

Drinking Water Health Advisory for the Cyanobacterial Microcystin Toxins

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-05-23 and 2017-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161480, Microcystins	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

325492

Pollutant:

Microcystins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 6 ug/L of microcystins as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.

Guideline Reference:

Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-05-23 and 2017-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Water Quality Control Plan (Basin Plan) for the North Coast Region


DECISION ID	155297	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Sixty-three lines of evidence are available in the administrative record to assess this pollutant. One hundred forty of the 404 samples exceed the guideline for the COLD beneficial use. LIST For BATCHTEL CREEK (LOEs 317838, 317842, 317846), there are three lines of evidence and 8 of 18 samples exceed the guideline. For BERRY CREEK (LOEs 317880, 317885, 317890, 317894), there are four lines of evidence and 12 of 41 samples exceed the guideline. For DAVIS CREEK (LOEs 317984, 317989, 317993, 317974, 317979, 317997), there are six lines of evidence and 34 of 83 samples exceed the guideline. For OLD OUTLET CREEK (LOEs 318352, 318357, 318362, 318366), there are four lines of evidence and 16 of 43 samples exceed the guideline. For OUTLET CREEK (LOEs 33874, 318370, 318377, 318382, 318385, 318388, 318392, 318396), there are eight lines of evidence and 50 of 97 samples exceed the guideline. For UPP CREEK (LOEs 318673, 318677, 318681), there are three lines of evidence and 6 of 12 samples exceed the guideline. DO NOT LIST For BEAR CREEK (LOEs 101058, 317869), there are two lines of evidence and 0 of 2 samples exceed the guideline. For BLUE SLIDES CREEK (LOEs 101059, 101083, 317915), there are three lines of evidence and 4 of the 11 samples exceed the guideline. For BUCKNELL CREEK (LOEs 101228, 101266), there are two lines of evidence and 0 of 2 samples exceed the guideline. For COLD CREEK (LOE 101060), there is one line of evidence and 0 of 1 sample exceeds the guideline. For COPPER BUTTE CREEK (LOE 317959), there is one line of evidence and 0 of 1 sample exceeds the guideline. For CORBIN CREEK (LOEs 101061, 317968), there are two lines of evidence and 0 of 7 samples exceed the guideline. For EEL RIVER (LOEs 34106, 101062, 101086, 318020, 318024, 318032, 318772, 318763, 318776, 318780), there are ten lines of evidence and 3 of 52 samples exceed the guideline. For HORSE CREEK (LOE 101063), there is one of line of evidence and 0 of 1 sample exceeds the guideline. For MILL CREEK (LOEs 318318, 318322, 318326), there are three lines of evidence and 4 of 18 samples exceed the guideline. For PANTHER CREEK (LOE 100975), there is one line of evidence and 0 of 1 sample exceeds the guideline. For RATTLESNAKE CREEK (LOE 101064), there is one line of evidence and 0 of 1 sample exceeds the guideline. For RICE CREEK (LOE 101084), there is one line of evidence and 0 of 1 sample exceeds the guideline. For THISTLE GLADE CREEK (LOE 101065), there is one line of evidence and 0 of 1 sample exceeds the guideline. For TROUT CREEK (LOEs 101085, 318669), there are two lines of evidence and 1 of 2 samples exceed the guideline. *For UPPER HAEHL CREEK (LOEs 318685, 318689, 318693), there are three lines of evidence and 2 of 8 samples exceed the guideline. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One hundred forty of the 404 samples exceed the guideline for the COLD beneficial use and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing only applies to Bachtel Creek, Berry Creek, Davis Creek, Old Outlet Creek, Outlet Creek, and Upp Creek.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101341

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Dissolved oxygen (DO) concentrations shall conform to the numeric objectives expressed in section 3.3.5.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Status Review of West Coast Steelhead from Washington, Idaho, Oregon, and California

Guideline Reference:

Status Review of Chinook Salmon from Washington, Idaho, Oregon, and California.

Guideline Reference:

Recovery Strategy for California Coho Salmon: Report to the California Fish and Game Commission

Spatial Representation:

Information pertains to the Eel River HU, Upper Main HA (Includes Tomki Creek)

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

Information is considered to be of adequate quality for the Integrated Report process.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318396

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, upstream; station code: BA-7.

Temporal Representation:

These samples were collected from 4/23/2011-7/22/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101084

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rice Creek ~0.5mi above Rice Fork (111PS0110).

Temporal Representation:

The samples were collected between the dates of 6/9/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101063

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Horse Creek above Eel River (111HSCAER).

Temporal Representation:

The samples were collected between the dates of 7/26/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101228

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 11/7/2013 - 12/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101266

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bucknell Creek above Eel River (111BN0329).

Temporal Representation:

The samples were collected between the dates of 11/7/2103 - 12/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101065

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Thistle Glade Creek ~1mi above Eel River (111TGCAER).

Temporal Representation:

The samples were collected between the dates of 7/24/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101060

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Cold Creek above Eel River (111FS0007).

Temporal Representation:

The samples were collected between the dates of 7/11/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101058

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Bear Creek ~1.2mi above Blue Slides Cr. (111FS0001).

Temporal Representation:

The samples were collected between the dates of 7/5/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101059

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 7/6/2011 - 7/19/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101083

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Blue Slides Creek above Bear Cr. (111FS0008).

Temporal Representation:

The samples were collected between the dates of 5/2/2012 - 6/7/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101064

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Rattlesnake Creek ~0.5mi above Eel River (111WER008).

Temporal Representation:

The samples were collected between the dates of 7/23/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101061

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s)Corbin Creek ~0.1mi abive Eel River (111CBCAER).

Temporal Representation:

The samples were collected between the dates of 8/8/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101085

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Trout Creek ~0.1mi above Eel River (111WER003).

Temporal Representation:

The samples were collected between the dates of 6/10/2014.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101062

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.4mi above Trout Cr. (111ERATRC).

Temporal Representation:

The samples were collected between the dates of 10/10/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

101086

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Dissolved oxygen concentrations shall conform to those limits listed in Section 3.3.5. Section 3.3.5 lists dissolved oxygen concentration limits for SPAWN beneficial use waters to be a daily minimum of 9.0 mg/L and a 7-day moving average of 11.0 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.75 miles above Wesley Ives Creek (111WE0816).

Temporal Representation:

The samples were collected between the dates of 6/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

33874

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Two of the 2 samples collected exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Outlet Creek station (111PS0008).

Temporal Representation:

Two samples were collected in September 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34106

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Zero of the 4 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Eel River above Dos Rios station (111ER6140).

Temporal Representation:

Samples were collected approximately once per quarter year from November 2007 to July 2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318370

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, upstream; station code: BA-16.

Temporal Representation:

These samples were collected from 4/4/2011-4/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318377

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek downstream of Davis Creek confluence; station code: WQ-27.

Temporal Representation:

These samples were collected from 10/19/2017-7/16/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318382

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at samplilng station name: Outlet Creek downstream of parcel 108-020-04; station code: WQ-19.

Temporal Representation:

These samples were collected from 10/20/2017-7/13/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318385

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Outlet Creek downstream of parcel 108-030-05; station code: WQ-18.

Temporal Representation:

These samples were collected from 10/18/2017-8/21/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318388

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 2 of 3 samples are less than the July-October minimum of 6.0 mg/L and 0 of 1 sample are less than the November-June minimum of 9.0 mg/L, so that 2 of 4 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, downstream; station code: BA-15.

Temporal Representation:

These samples were collected from 4/10/2011-8/11/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318392

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, middle; station code: BA-14.

Temporal Representation:

These samples were collected from 4/11/2011-8/12/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318669

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Trout Creek ~0.2mi above Eel River; station code: 111TTCAER

Temporal Representation:

This sample was collected on 6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318673

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, downstream; station code: BA-13.

Temporal Representation:

These samples were collected from 4/5/2011-5/2/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318677

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, middle; station code: BA-12.

Temporal Representation:

These samples were collected from 4/5/2011-5/3/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318681

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Upp Creek, upstream; station code: BA-11.

Temporal Representation:

These samples were collected from 4/8/2011-5/4/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318780

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.63.123.34; station code: ADVENTURESCIENTISTS-39.63.123.34.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317846

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, upper; station code: BA-4

Temporal Representation:

These samples were collected from 4/22/2011-7/13/2023

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317880

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek downstream of parcel 108-060-02; station code: WQ-28

Temporal Representation:

These samples were collected from 11/17/2017-6/5/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317885

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the water quality objective of 6 mg/L from July-October and 5 of 18 samples exceed the water quality objective of 9 mg/L from November-June, so that 5 of 18 sample exceeds the dissolved oxygen water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek upstream of Category 1 riparian creation on parcel 108-070-09; station code: WQ-26.

Temporal Representation:

These samples were collected from 11/16/2017-6/26/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317890

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples exceed the water quality objective of 6 mg/L from July-October and 1 of 3 samples exceed the water quality objective of 9 mg/L from November-June, so that 1 of 3 sample exceeds the dissolved oxygen water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sample station name: Berry Creek, downstream; station code: BA-24.

Temporal Representation:

These samples were collected on 4/12/2011, 5/14/2018, and 7/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317894

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station: Berry Creek, upstream; station ID: BA-22

Temporal Representation:

These samples were collected on 4/13/2011, 7/10/2011, 5/15/2018, and 4/6/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317869

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: Bear Creek below FS road 17NO2; station code: 111CE0551

Temporal Representation:

This sample was collected on 5/27/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317838

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, downstream; station code: BA-6.

Temporal Representation:

These samples were collected from 5/16/2021-7/21/2021

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317842

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, middle; station code: BA-5

Temporal Representation:

These samples were collected from 7/21/2011-7/12/2022

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317915

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project SWAMP Reference Condition Management Plan and determined that 0 of 2 samples exceed the July-October water quality objective of 6 mg/L and 4 of 5 samples exceed the November-June water quality objective of 9 mg/L, so that 4 of 7 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Blue Slides Creek above Bear Cr.; station code: 111FS0008.

Temporal Representation:

These samples were collected from 6/1/2016-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317984

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek upstream of parcel 108-070-08; station code: WQ-23.

Temporal Representation:

These samples were collected from 10/20/2017-7/19/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317989

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Davis Creek, downstream; station code: BA-21.

Temporal Representation:

These samples were collected from 5/24/2011-7/14/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317993

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 2 of 3 samples exceed the July-October water quality objective of 6 mg/L and 1 of 3 samples exceed the November-June water quality objective of 9 mg/L, so that 3 of 6 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, middle; station code: BA-20.

Temporal Representation:

These samples were collected from 4/25/2011-7/15/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317997

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 2 of 3 samples exceed the July-October water quality objective of 6 mg/L and 0 of 3 samples exceed the November-June water quality objective of 9 mg/L, so that 2 of 6 samples exceed the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, upstream; station code: BA-19.

Temporal Representation:

These samples were collected from 4/9/2011-7/16/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317959

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assess data for parent project SWAMP Reference Condition Management Plan and determined that 0 of 0 samples exceed the July-October water quality objective of 6 mg/L and 0 of 1 sample exceeds the November-June water quality objective of 9 mg/L, so that 0 of 1 sample exceeds the water quality objective for dissolved oxygen.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Copper Butte Creek ~0.5mi above Eel River; station code: 111WER159

Temporal Representation:

This sample was collected on 11/6/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318020

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Dos Rios; station code: 111ER6140.

Temporal Representation:

These samples were collected from 6/7/2018-8/2/2019

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318024

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Outlet Creek; station code: 111ER6381.

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317968

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Corbin Creek ~0.1mi above NF; station code: 111CBCANI

Temporal Representation:

These samples were collected from 6/2/2016-6/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318032

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River at Trout Creek Campground; station code: 111ER8102

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016-8/14/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317974

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-010-06; station code: WQ-25.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318366

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, middle; station code: BA-17.

Temporal Representation:

These samples were collected from 4/26/2011-4/8/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318362

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, downstream; station code: BA-18.

Temporal Representation:

These samples were collected from 5/24/2011-4/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318772

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.38.123.1; station code: ADVENTURESCIENTISTS-39.38.123.1.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318763

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA; site code: USGS-11471500.

Temporal Representation:

This sample was collected on 6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318776

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.49.123.23; station code: ADVENTURESCIENTISTS-39.49.123.23.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318693

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 2 of 3 samples are greater than the November-June minimum of 9.0 mg/L, so that 2 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, upper; station code: BA-1.

Temporal Representation:

These samples were collected from 4/6/2011-5/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318689

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 0 of 1 sample is less than the November-June minimum of 9.0 mg/L, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Upper Haehl Creek, middle; station code: BA-2.

Temporal Representation:

This sample was collected on 4/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318685

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, downstream; station code: BA-3.

Temporal Representation:

These samples were collected from 4/7/2011-5/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318357

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 0 samples are less than the July-October minimum of 6.0 mg/L and 6 of 16 samples are less than the November-June minimum of 9.0 mg/L, so that 6 of 16 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area; station code: WQ-22.

Temporal Representation:

These samples were collected from 11/9/2017-6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318352

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area; station code: WQ-21.

Temporal Representation:

These samples were collected from 11/9/2017-7/2/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318326

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, upstream; station code: BA-8.

Temporal Representation:

These samples were collected from 4/21/2011-6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318318

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed dissolved oxygen data for Willits Bypass Monitoring and Reporting Program and determined that 0 of 2 samples are less than the July-October minimum of 6.0 mg/L and 2 of 4 samples are less than the November-June minimum of 9.0 mg/L, so that 2 of 6 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, downstream; station code: BA-10.

Temporal Representation:

These samples were collected from 4/24/2011-5/31/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318322

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, middle; station code: BA-9.

Temporal Representation:

These samples were collected from 4/24/2011-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317979

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-060-01; station code: WQ-24.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155297, Oxygen, Dissolved	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100975

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Panther Creek ~2.6mi above Welch Cr. (111PS0160).

Temporal Representation:

The samples were collected between the dates of 7/25/2011.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	157286	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Saxitoxins
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Three of eight samples exceed the objective for the Municipal & Domestic Supply beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of eight samples exceed the objective for the Municipal & Domestic Supply beneficial use and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to the mainstem Eel River.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157286, Saxitoxins	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

326516

Pollutant:

Saxitoxins

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP RWB1 Monitoring data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 3 of 8 samples exceeded the water quality threshold for Saxitoxins.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

The evaluation guideline for saxitoxins for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.3 ug/L.

Guideline Reference:

Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority

Spatial Representation:

The samples were collected at 1 monitoring site: 111ER8102 (Eel River at Trout Creek Campground).

Temporal Representation:

The samples were collected between the dates of 2017-06-14 and 2017-10-31

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):


DECISION ID	168429	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Sediment
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Regional Water Board Conclusion: This pollutant was considered for placement on the section 303(d) List in a previous Integrated Report cycle under the pollutant name Sedimentation/Siltation. No new information was reviewed for this current Integrated Report cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for listing under Section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment were established by US EPA on December 29, 2004. Based on the readily available information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the Section 303(d) list. This listing applies to the entire waterbody. This listing applies to the entire waterbody.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA as Sedimentation/Siltation. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:	This listing applies to the entire waterbody.

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 168429, Sediment	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

4783

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unknown

Temporal Representation:

Unknown

Environmental Conditions:

Unknown

QAPP Information:

Unknown

QAPP Information Reference(s):


DECISION ID	163006	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Specific Conductivity
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Forty-eight lines of evidence are available in the administrative record to assess this pollutant. Thirty-nine of 148 samples exceed the cold beneficial use guideline and three of 46 samples exceed the Municipal & Domestic Supply beneficial use guideline. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Thirty-nine of 148 samples exceed the cold beneficial use guideline and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to Baechtel Creek and Blue Slides Creek. ***COLD FRESHWATER HABITAT BAECHTEL CREEK has three lines of evidence (LOEs 317840, 317844, 317848) and 5 of 11 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. BEAR CREEK has one line of evidence (LOE 317871) and 0 of 1 sample exceeds the guideline BERRY CREEK has four lines of evidence (LOEs 317882, 317887, 317892, 317896) and 4 of 40 samples exceeds the guideline BLUE SLIDES CREEK has one line of evidence (LOE 317917) and 6 of 6 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. COPPER BUTTER CREEK has one line of evidence (LOE 317961) and 1 of 1 sample exceeds the guideline CORBIN CREEK has one line of evidence (LOE 317970) and 4 of 6 samples exceed the guideline DAVIS CREEK has six lines of evidence (LOEs 317976, 317981, 317986, 317991, 317995, 317999) and 1 of 15 samples exceed the guideline EEL RIVER has seven lines of evidence (LOEs 318022, 318026, 318034, 318764, 318774, 318778, 318782) and 4 of 11 samples exceed the guideline. MILL CREEK has three lines of evidence (LOEs 318320, 318324, 318328) and 2 of 12 samples exceed the guideline. OLD OUTLET CREEK has five lines of evidence (LOEs 318354, 318359, 318364, 318368, 318372) and 3 of 13 samples exceed the guideline. OUTLET CREEK has four lines of evidence (LOEs 318379, 318390, 318394, 318398) and 4 of 11 samples exceed the guideline. TROUT CREEK has one line of evidence (LOE 318671) and 1 of 1 sample exceeds the guideline. UPP CREEK has three lines of evidence (LOEs 318675, 318679, 318683) and 1 of 12 samples exceed the guideline. UPPER HAEHL CREEK has three lines of evidence (LOEs 318687, 318691, 318695) and 3 of 8 samples exceed the guideline.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:	***COLD FRESHWATER HABITAT BAECHTEL CREEK has three lines of evidence (LOEs 317840, 317844, 317848) and 5 of 11 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. BEAR CREEK has one line of evidence (LOE 317871) and 0 of 1 sample exceeds the guideline BERRY CREEK has four lines of evidence (LOEs 317882, 317887, 317892, 317896) and 4 of 40 samples exceeds the guideline BLUE SLIDES CREEK has one line of evidence (LOE 317917) and 6 of 6 samples exceed the guideline, which exceeds the allowable frequency in Table 3.2 of the Listing Policy. COPPER BUTTER CREEK has one line of evidence (LOE 317961) and 1 of 1 sample exceeds the guideline CORBIN CREEK has one line of evidence (LOE 317970) and 4 of 6 samples exceed the guideline DAVIS CREEK has six lines of evidence (LOEs 317976, 317981, 317986, 317991, 317995, 317999) and 1 of 15 samples exceed the guideline EEL RIVER has seven lines of evidence (LOEs 318022, 318026, 318034, 318764, 318774, 318778, 318782) and 4 of 11 samples exceed the guideline. MILL CREEK has three lines of evidence (LOEs 318320, 318324, 318328) and 2 of 12 samples exceed the guideline. OLD OUTLET CREEK has five lines of evidence (LOEs 318354, 318359, 318364, 318368, 318372) and 3 of 13 samples exceed the guideline. OUTLET CREEK has four lines of evidence (LOEs 318379, 318390, 318394, 318398) and 4 of 11 samples exceed the guideline. TROUT CREEK has one line of evidence (LOE 318671) and 1 of 1 sample exceeds the guideline. UPP CREEK has three lines of evidence (LOEs 318675, 318679, 318683) and 1 of 12 samples exceed the guideline. UPPER HAEHL CREEK has three lines of evidence (LOEs 318687, 318691, 318695) and 3 of 8 samples exceed the guideline.

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317961

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Copper Butte Creek ~0.5mi above Eel River; station code: 111WER159

Temporal Representation:

This sample was collected on 11/6/2018.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318022

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Dos Rios; station code: 111ER6140.

Temporal Representation:

These samples were collected from 6/7/2018-8/2/2019

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318026

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River above Outlet Creek; station code: 111ER6381.

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317970

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Corbin Creek ~0.1mi above NF; station code: 111CBCANI

Temporal Representation:

These samples were collected from 6/2/2016-6/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318034

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River at Trout Creek Campground; station code: 111ER8102

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016-8/14/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317981

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-060-01; station code: WQ-24.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317976

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-010-06; station code: WQ-25.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318320

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, downstream; station code: BA-10.

Temporal Representation:

These samples were collected from 4/24/2011-5/31/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318359

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area; station code: WQ-22.

Temporal Representation:

These samples were collected from 11/9/2017-6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318328

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, upstream; station code: BA-8.

Temporal Representation:

These samples were collected from 4/21/2011-6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318324

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Mill Creek, middle; station code: BA-9.

Temporal Representation:

These samples were collected from 4/24/2011-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318354

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area; station code: WQ-21.

Temporal Representation:

These samples were collected from 11/9/2017-7/2/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318695

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, upper; station code: BA-1.

Temporal Representation:

These samples were collected from 4/6/2011-5/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318683

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Upp Creek, upstream; station code: BA-11.

Temporal Representation:

These samples were collected from 4/8/2011-5/4/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318691

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Upper Haehl Creek, middle; station code: BA-2.

Temporal Representation:

This sample was collected on 4/6/2011.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318368

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, middle; station code: BA-17.

Temporal Representation:

These samples were collected from 4/26/2011-4/8/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318390

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar year 2011 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar years 2018 and 2022 exceed the 50% upper limit of 200 micromhos, so that 2 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, downstream; station code: BA-15.

Temporal Representation:

These samples were collected from 4/10/2011-8/11/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318671

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Trout Creek ~0.2mi above Eel River; station code: 111TTCAER

Temporal Representation:

This sample was collected on 6/2/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318394

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011 and 2018 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar year 2022 exceed the 50% upper limit of 200 micromhos, so that 1 of 3 samples exceed the water quality objective.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, middle; station code: BA-14.

Temporal Representation:

These samples were collected from 4/11/2011-8/12/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318679

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, middle; station code: BA-12.

Temporal Representation:

These samples were collected from 4/5/2011-5/3/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317991

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Davis Creek, downstream; station code: BA-21.

Temporal Representation:

These samples were collected from 5/24/2011-7/14/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318764

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA; site code: USGS-11471500.

Temporal Representation:

This sample was collected on 6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318372

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar year 2011 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar years 2018 and 2022 exceeded the 50% upper limit of 200 micromhos, so that 2 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, upstream; station code: BA-16.

Temporal Representation:

These samples were collected from 4/4/2011-4/4/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318675

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upp Creek, downstream; station code: BA-13.

Temporal Representation:

These samples were collected from 4/5/2011-5/2/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318774

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.38.123.1; station code: ADVENTURESCIENTISTS-39.38.123.1.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318364

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek, downstream; station code: BA-18.

Temporal Representation:

These samples were collected from 5/24/2011-4/7/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318398

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed specific conductivity data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2011 and 2018 did not exceed either the 90% upper limit of 400 micromhos or 50% upper limit of 200 micromhos and that calendar year 2022 exceed the 50% upper limit of 200 micromhos, so that 1 of 3 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek, upstream; station code: BA-7.

Temporal Representation:

These samples were collected from 4/23/2011-7/22/2021.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318379

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek downstream of Davis Creek confluence; station code: WQ-27.

Temporal Representation:

These samples were collected from 10/19/2017-7/16/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34403

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 2 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Eel River is a 90% upper limit of 375 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 225 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Eel River above Dos Rios station (111ER6140).

Temporal Representation:

Samples were collected on the following dates: 11/13/2007 2/26/2008 4/8/2008 7/15/2008

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008).

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

44471

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP data for Outlet Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceed the 50% upper limit criterion for Specific Conductivity.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for Outlet Creek is a 90% upper limit of 400 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 200 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Eel River HU, Upper Main HA (Includes Tomki Creek) was collected at 1 monitoring site [ Outlet Creek - 111PS0008]

Temporal Representation:

Data was collected over the time period 9/9/2008-9/29/2008.

Environmental Conditions:

Staff is not aware of any special conditions that might affect interpretation of the data.

QAPP Information:

The SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

21240

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 41 specific conductivity grab samples collected from the Upper Mainstem Eel River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).

Data Reference:

Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).

QAPP Information Reference(s):

Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100787

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for specific conductance. Data range from 77 microhmos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: Specific conductivity shall conform to Table 3-1 which states that water quality objective for specific conductivity has an 90% upper limit of 375 micromhus and a 50% upper limit of 225 micromhos.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.75 miles above Wesley Ives Creek(111WE0816)

Temporal Representation:

The samples were collected between the dates 06/12/2013.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

100797

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for specific conductance. Data range from 246 microhmos.

Data Reference:

Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) Eel River ~1.4mi above Trout Cr.
(111ERATRC)

Temporal Representation:

The samples were collected between the dates 10/10/2012.

Environmental Conditions:

There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318782

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.63.123.34; station code: ADVENTURESCIENTISTS-39.63.123.34.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318778

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station name: Eel Wild and Scenic River-39.49.123.23; station code: ADVENTURESCIENTISTS-39.49.123.23.

Temporal Representation:

This sample was collected on 6/23/2021.

Environmental Conditions:

QAPP Information:

QAPP for Adventure Scientists (Volunteer)*

QAPP Information Reference(s):

Adventure Scientists - Adventure Scientists QAPP - Adventure Scientists (Volunteer)* - 402638

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317844

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, middle; station code: BA-5

Temporal Representation:

These samples were collected from 7/21/2011-7/12/2022

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317887

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek upstream of Category 1 riparian creation on parcel 108-070-09; station code: WQ-26.

Temporal Representation:

These samples were collected from 11/16/2017-6/26/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317882

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek downstream of parcel 108-060-02; station code: WQ-28

Temporal Representation:

These samples were collected from 11/17/2017-6/5/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317892

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sample station name: Berry Creek, downstream; station code: BA-24.

Temporal Representation:

These samples were collected on 4/12/2011, 5/14/2018, and 7/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317896

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station: Berry Creek, upstream; station ID: BA-24

Temporal Representation:

These samples were collected on 4/13/2011, 7/10/2011, 5/15/2018, and 4/6/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317848

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, upper; station code: BA-4

Temporal Representation:

These samples were collected from 4/22/2011-7/13/2023

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317840

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Baechtel Creek, downstream; station code: BA-6.

Temporal Representation:

These samples were collected from 4/23/2011-7/21/2021

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317871

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: Bear Creek below FS road 17NO2; station code: 111CE0551

Temporal Representation:

This sample was collected on 5/27/2015.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP Reference Condition Management Plan

QAPP Information Reference(s):

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317917

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Blue Slides Creek above Bear Cr.; station code: 111FS0008.

Temporal Representation:

These samples were collected from 6/1/2016-6/1/2022.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317986

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek upstream of parcel 108-070-08; station code: WQ-23.

Temporal Representation:

These samples were collected from 10/20/2017-7/19/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317999

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, upstream; station code: BA-19.

Temporal Representation:

These samples were collected from 4/9/2011-7/16/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317995

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek, middle; station code: BA-20.

Temporal Representation:

These samples were collected from 4/25/2011-7/15/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 163006, Specific Conductivity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318687

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Upper Haehl Creek, downstream; station code: BA-3.

Temporal Representation:

These samples were collected from 4/7/2011-5/5/2022.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	155300	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Total Dissolved Solids
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Fourteen lines of evidence are available in the administrative record to assess this pollutant. Seven of the 26 samples exceed the MUN beneficial use objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Seven of the 26 samples exceed the MUN beneficial use objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to Outlet Creek. BERRY CREEK has two lines of evidence (LOEs 317884, 317889) and 0 of 4 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. DAVIS CREEK has three lines of evidence (LOEs 317978, 317983, 317988) and 0 of 6 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. EEL RIVER has three lines of evidence (LOEs 34900, 318036, 318766) and 1 of 5 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. OLD OUTLET CREEK has one line of evidence (LOE 318356) and 1 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. OUTLET CREEK has five lines of evidence (LOEs 34358, 318361, 318381, 318384, 318387) and 5 of 10 samples exceed the MUN beneficial use objective, which exceeds the allowable frequency in Table 3.2 of the Listing Policy.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:	BERRY CREEK has two lines of evidence (LOEs 317884, 317889) and 0 of 4 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. DAVIS CREEK has three lines of evidence (LOEs 317978, 317983, 317988) and 0 of 6 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. EEL RIVER has three lines of evidence (LOEs 34900, 318036, 318766) and 1 of 5 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. OLD OUTLET CREEK has one line of evidence (LOE 318356) and 1 of 2 samples exceed the MUN beneficial use objective, which is insufficient data to apply Table 3.2 of the Listing Policy. OUTLET CREEK has five lines of evidence (LOEs 34358, 318361, 318381, 318384, 318387) and 5 of 10 samples exceed the MUN beneficial use objective, which exceeds the allowable frequency in Table 3.2 of the Listing Policy.

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318387

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2017 and 2018 exceed both the 90% upper limit of 230 mg/L and 50% upper limit of 125 mg/L, so that 2 of 2 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective is a 90% upper limit of 230 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 125 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected from sampling station name: Outlet Creek downstream of parcel 108-030-05; station code: WQ-18.

Temporal Representation:

These samples were collected from 10/18/2017-8/21/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318381

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2017 and 2018 did not exceed either the 90% upper limit of 230 mg/L or 50% upper limit of 125 mg/L, so that 0 of 2 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Outlet Creek downstream of Davis Creek confluence; station code: WQ-27.

Temporal Representation:

These samples were collected from 10/19/2017-7/16/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318361

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for Willits Bypass Monitoring and Reporting Program and determined that calendar years 2017 exceeds both the the 90% upper limit of 230 mg/L or 50% upper limit of 125 mg/L and calendar year 2018 does not exceed either upper limit, so that 1 of 2 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area; station code: WQ-22.

Temporal Representation:

These samples were collected from 11/9/2017-6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318766

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for USGS California Water Science Center and determined that calendar year 2018 does not exceed either the 90% or 50% upper limit, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

WQX from the NWQMP for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

This sample was collected at sampling station: EEL R A VAN ARSDALE DAM NR POTTER VALLEY CA; site code: USGS-11471500.

Temporal Representation:

This sample was collected on 6/4/2018.

Environmental Conditions:

QAPP Information:

QAPP for USGS California Water Science Center

QAPP Information Reference(s):

QAPP for USGS Data Collected during the 2026 Integrated Report Cycle

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318356

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area; station code: WQ-21.

Temporal Representation:

These samples were collected from 11/9/2017-7/2/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317884

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data from parent project Willits Bypass Monitoring and Reporting Program and determined calendar years 2017 and 2018 do not exceed either the 90% upper limit of 230 mg/L or 50% upper limit of 125 mg/L, so that 0 of the 2 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Eel River is a 90% upper limit of 275 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 140 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek downstream of parcel 108-060-02; station code: WQ-28

Temporal Representation:

These samples were collected from 11/17/2017-6/5/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317889

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data from parent project Willits Bypass Monitoring and Reporting Program and determined that calendar years 2017 and 2018 did not exceed either the 90% upper limit of 230 mg/L or the 50% upper limit of 125 mg/L, so that 0 of the 2 samples exceed the water quality objective for total dissolved solids.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Berry Creek upstream of Category 1 riparian creation on parcel 108-070-09; station code: WQ-26.

Temporal Representation:

These samples were collected from 11/16/2017-6/26/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317983

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for parent project Willits Bypass Monitoring Program and determined that 0 of 1 sample in 2017 and 0 of 1 sample in 2018 exceed the 90% upper limit of 230 mg/L and 0 of 1 sample in 2017 and 0 of 1 sample in 2018 exceed the 50% upper limit of 125 mg/L, so that 0 of 2 samples exceed the water quality objective for total dissolved solids.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-060-01; station code: WQ-24.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317988

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek upstream of parcel 108-070-08; station code: WQ-23.

Temporal Representation:

These samples were collected from 10/20/2017-7/19/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318036

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for parent project SWAMP RWB1 Monitoring and determined that calendar year 2017 did not exceed either the 90% upper limit of 275 mg/L or the 50% upper limit of 140 mg/L, so that 0 of 1 sample exceeds the water quality objective.

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Eel River at Trout Creek Campground; station code: 111ER8102

Temporal Representation:

These samples were collected from 6/16/2016-10/1/2016-8/14/2019.

Environmental Conditions:

QAPP Information:

QAPP for SWAMP RWB1 Monitoring

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

317978

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at sampling station name: Davis Creek downstream of parcel 108-010-06; station code: WQ-25.

Temporal Representation:

These samples were collected from 11/9/2017-7/18/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34358

Pollutant:

Salinity/TDS/Chlorides

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Neither of the 2 samples exceeded the objectives.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Salinity data (ppt) were converted to Total Dissolved Solids (mg/L) so that the data could be compared to the Secondary MCL for TDS (1ppt = 1000 mg/L). Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for TDS in Outlet Creek is a 90% upper limit of 230 mg/L. Therefore, 90% of the values must be lower than this limit. In addition the site specific objective of 50% upper limit of 125 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means must be less than or equal to an upper limit.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at the Outlet Creek station (111PS0008).

Temporal Representation:

The samples were collected on 9/9/2008 and 9/29/2008.

Environmental Conditions:

QAPP Information:

SWAMP QAPP (2008) was followed.

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

34900

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of the 2 samples exceeded the objective.

Data Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Eel River above Dos Rios station (111ER6140).

Temporal Representation:

Samples were collected on the following dates: 11/13/2007 2/26/2008 4/8/2008 7/15/2008

Environmental Conditions:

QAPP Information:

N/A

QAPP Information Reference(s):

Surface Water Ambient Monitoring Program Quality Assurance Program Plan

Line of Evidence (LOE) for Decision ID 155300, Total Dissolved Solids	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

318384

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed total dissolved solids data for Willits Bypass Monitoring and Reporting Program and determined that calendar year 2017 exceeds both the 90% upper limit of 230 mg/L and 50% upper limit of 125 mg/L and calendar year 2018 exceeds the 50% upper limit of 125 mg/L, so that 2 of 2 samples exceed the water quality objective.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

These samples were collected at samplilng station name: Outlet Creek downstream of parcel 108-020-04; station code: WQ-19.

Temporal Representation:

These samples were collected from 10/20/2017-7/13/2018.

Environmental Conditions:

QAPP Information:

QAPP for Willits Bypass Monitoring and Reporting Program

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	157295	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Turbidity
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Forty-one lines of evidence are available in the administrative record to assess this pollutant. Twelve of 30 samples exceed the objective for Berry Creek, 12 of 57 samples exceed the objective for Davis Creek, 15 of 32 samples exceed the objective for Old Outlet Creek, and 25 of 60 samples exceed the objective for Outlet Creek. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Twelve of 30 samples exceed the objective for Berry Creek, 12 of 57 samples exceed the objective for Davis Creek, 15 of 32 samples exceed the objective for Old Outlet Creek, and 25 of 60 samples exceed the objective for Outlet Creek, and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. This listing applies to Berry Creek, Davis Creek, Old Outlet Creek, and Outlet Creek. BAECHTEL CREEK has three lines of evidence (LOEs 327208, 327287, 327363) and 3 of 18 samples exceed the objective. BEAR CREEK has one line of evidence (LOE 327329) and 0 of 1 sample exceeds the objective. BERRY CREEK has four lines of evidence (LOEs 327248, 327262, 327300, 327336) and 12 of 30 samples exceed the objective. BLUE SLIDES CREEK has two lines of evidence (LOEs 327247, 327301) and 1 of 6 samples exceed the objective. COPPER BUTTE CREEK has one line of evidence (LOE 327331) and 0 of 1 sample exceeds the objective. CORBIN CREEK has two lines of evidence (LOEs 327264, 327296) and 0 of 6 samples exceed the objective. DAVIS CREEK has six lines of evidence (LOEs 327201, 327202, 327310, 327343, 327347, 327360) and 21 of 57 samples exceed the objective. GARCIA CREEK has one line of evidence (LOE 327239) and 0 of 1 sample exceeds the objective. MILL CREEK has three lines of evidence (LOEs 327259, 327334, 327362) and 2 of 18 samples exceed the objective. OLD OUTLET CREEK has five lines of evidence (LOEs 327254, 327276, 327292, 327297, 327352) and 15 of 32 samples exceed the objective. OUTLET CREEK has six lines of evidence (LOEs 327215, 327225, 327227, 327240, 327250, 327326) and 25 of 60 samples exceed the objective. TROUT CREEK has one line of evidence (LOE 327216) and 0 of 1 sample exceeds the objective. UPP CREEK has three lines of evidence (LOEs 327218, 327260, 327345) and 0 of 11 samples exceed the objective. UPPER HAEHL CREEK has three lines of evidence (LOEs 327261, 327311, 327350) and 3 of 8 samples exceed the objective.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:	BAECHTEL CREEK has three lines of evidence (LOEs 327208, 327287, 327363) and 3 of 18 samples exceed the objective. BEAR CREEK has one line of evidence (LOE 327329) and 0 of 1 sample exceeds the objective. BERRY CREEK has four lines of evidence (LOEs 327248, 327262, 327300, 327336) and 12 of 30 samples exceed the objective. BLUE SLIDES CREEK has two lines of evidence (LOEs 327247, 327301) and 1 of 6 samples exceed the objective. COPPER BUTTE CREEK has one line of evidence (LOE 327331) and 0 of 1 sample exceeds the objective. CORBIN CREEK has two lines of evidence (LOEs 327264, 327296) and 0 of 6 samples exceed the objective. DAVIS CREEK has six lines of evidence (LOEs 327201, 327202, 327310, 327343, 327347, 327360) and 21 of 57 samples exceed the objective. GARCIA CREEK has one line of evidence (LOE 327239) and 0 of 1 sample exceeds the objective. MILL CREEK has three lines of evidence (LOEs 327259, 327334, 327362) and 2 of 18 samples exceed the objective. OLD OUTLET CREEK has five lines of evidence (LOEs 327254, 327276, 327292, 327297, 327352) and 15 of 32 samples exceed the objective. OUTLET CREEK has six lines of evidence (LOEs 327215, 327225, 327227, 327240, 327250, 327326) and 25 of 60 samples exceed the objective. TROUT CREEK has one line of evidence (LOE 327216) and 0 of 1 sample exceeds the objective. UPP CREEK has three lines of evidence (LOEs 327218, 327260, 327345) and 0 of 11 samples exceed the objective. UPPER HAEHL CREEK has three lines of evidence (LOEs 327261, 327311, 327350) and 3 of 8 samples exceed the objective.

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327301

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

California Maximum Contaminant Levels (MCLs) apply to ambient surface waters under the Basin Plan's 'Chemical Constituents' objective. The Secondary MCL for turbidity is 5 NTU. Calculation of a numeric objective for other beneficial uses requires comparison with upstream or other background data which may not be available as part of the data used for water quality assessment.

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2017-06-20 and 2022-06-01

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327215

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-15 (Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-10 and 2022-08-11

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327297

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 5 of 10 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-22 (Old Outlet Creek west of parcel 108-010-06 downstream of Category II riparian creation area).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-06-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327296

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2016-06-02 and 2018-07-10

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327218

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-13 (Upp Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-05 and 2021-05-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327216

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 111TTCAER (Trout Creek ~0.2mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2022-06-02 and 2022-06-02

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327225

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 5 of 14 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-19 (Outlet Creek downstream of parcel 108-020-04).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327227

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-14 (Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-11 and 2022-08-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327310

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-19 (Davis Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-09 and 2022-07-16

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327311

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-3 (Upper Haehl Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-07 and 2022-05-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327239

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 111GCABPC (Garcia Creek above Bear Pen Cr.).

Temporal Representation:

The samples were collected between the dates of 2018-07-24 and 2018-07-24

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327240

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-7 (Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-23 and 2021-07-22

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327247

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 111FS0008 (Blue Slides Creek above Bear Cr.).

Temporal Representation:

The samples were collected between the dates of 2016-06-01 and 2018-07-09

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327248

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-22 (Berry Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-13 and 2022-04-06

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327326

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 12 of 14 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-27 (Outlet Creek downstream of Davis Creek confluence).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-07-16

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327250

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 7 of 17 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-18 (Outlet Creek downstream of parcel 108-030-05).

Temporal Representation:

The samples were collected between the dates of 2017-10-20 and 2018-08-21

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327329

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 111CE0551 (Bear Creek below FS road 17NO2).

Temporal Representation:

The samples were collected between the dates of 2015-05-27 and 2015-05-27

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327331

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 111WER159 (Copper Butte Creek ~0.5mi above Eel River).

Temporal Representation:

The samples were collected between the dates of 2018-11-06 and 2018-11-06

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327254

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-17 (Old Outlet Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-26 and 2022-04-08

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327334

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-9 (Mill Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-24 and 2022-06-01

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327336

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 7 of 12 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-26 (Berry Creek upstream of Category I riparian creation on parcel 108-070-09).

Temporal Representation:

The samples were collected between the dates of 2017-11-20 and 2018-06-26

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327259

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-8 (Mill Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-21 and 2022-06-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327260

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-12 (Upp Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-05 and 2021-05-03

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327261

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-2 (Upper Haehl Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-06 and 2011-04-06

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327262

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 5 of 11 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-28 (Berry Creek downstream of parcel 108-060-02).

Temporal Representation:

The samples were collected between the dates of 2017-11-20 and 2018-06-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327343

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 8 of 13 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-24 (Davis Creek downstream of parcel 108-060-01).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-07-18

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327264

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed SWAMP Reference Condition Management Plan data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: 111CBCANF (Corbin Creek ~0.1mi above NF).

Temporal Representation:

The samples were collected between the dates of 2017-06-21 and 2022-06-07

Environmental Conditions:

QAPP Information:

QAPP for Surface Water Ambient Monitoring Program (SWAMP)

QAPP Information Reference(s):

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327345

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Turbidity.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-11 (Upp Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-08 and 2018-05-09

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327347

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 4 of 13 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-23 (Davis Creek upstream of parcel 108-070-08).

Temporal Representation:

The samples were collected between the dates of 2017-11-09 and 2018-07-19

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327350

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 3 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-1 (Upper Haehl Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2011-04-06 and 2022-05-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327352

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-18 (Old Outlet Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2022-04-07

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327276

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 3 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-16 (Old Outlet Creek, upstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-04 and 2022-04-04

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327201

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-20 (Davis Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-25 and 2022-07-15

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327202

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-21 (Davis Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-05-24 and 2022-07-14

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327360

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 7 of 14 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-25 (Davis Creek downstream of parcel 108-010-05).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-07-18

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327362

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-10 (Mill Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-24 and 2022-05-31

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327208

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 2 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-6 (Baechtel Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-23 and 2021-07-21

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327287

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-5 (Baechtel Creek, middle).

Temporal Representation:

The samples were collected between the dates of 2011-04-22 and 2022-07-12

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327363

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-4 (Baechtel Creek, upper).

Temporal Representation:

The samples were collected between the dates of 2011-04-22 and 2022-07-13

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327292

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 7 of 12 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: WQ-21 (Old Outlet Creek west of parcel 108-010-06 along Category I riparian creation area).

Temporal Representation:

The samples were collected between the dates of 2017-11-13 and 2018-07-02

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring

Line of Evidence (LOE) for Decision ID 157295, Turbidity	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

327300

Pollutant:

Turbidity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Willits Bypass Monitoring and Reporting Program data for Eel River HU, Upper Main HA (Includes Tomki Creek) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Turbidity.

Data Reference:

Benthic, Field, Habitat, WQ from the Willits Bypass Project for the 2026 Integrated Report in Region 1

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan (Basin Plan) for the North Coast Region

Evaluation Guideline:

Guideline Reference:

California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring

Spatial Representation:

The samples were collected at 1 monitoring site: BA-24 (Berry Creek, downstream).

Temporal Representation:

The samples were collected between the dates of 2011-04-12 and 2022-04-05

Environmental Conditions:

QAPP Information:

Sampling and analysis were conducted in accordance with the Willits Bypass Project QAPP.

QAPP Information Reference(s):

Quality Assurance Project Plan for Willits Bypass Project ¿ Surface Water Quality Monitoring


DECISION ID	73885	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

Pollutant:	Sedimentation/Siltation
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	Agriculture-grazing \| Construction/Land Development \| Erosion/Siltation \| Flow Alteration/Regulation/Modification \| Harvesting, Restoration, Residue Management \| Highway/Road/Bridge Construction \| Logging Road Construction/Maintenance \| Removal of Riparian Vegetation \| Silvicultural Point Sources \| Silviculture \| Streambank Modification/Destabilization
TMDL Name:	Eel River, Upper Mainstem Sediment and Temperature TMDLs
TMDL Project Code:	602
Date TMDL Approved by USEPA:	12/29/2004
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Regional Water Board Conclusion: This pollutant was considered for placement on the section 303(d) List in a previous Integrated Report cycle. No new information was reviewed for this current Integrated Report cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for listing under Section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Upper Main Eel River and Tributaries (including Tomki Creek, Outlet Creek and Lake Pillsbury) Total Maximum Daily Loads for Temperature and Sediment were established by US EPA on December 29, 2004. Based on the readily available information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the Section 303(d) list.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 73885, Sedimentation/Siltation	Region 1
Eel River HU, Upper Main HA (Includes Tomki Creek)

LOE ID:

4783

Pollutant:

Sedimentation/Siltation

LOE Subgroup:

Pollutant-Water

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

Data Reference: