Draft California 2020 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	Mendocino Coast HU, Rockport HA, Ten Mile River HSA
Water Body ID:	CAR1131304519980708163410
Water Body Type:	River & Stream


DECISION ID	103987	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

Pollutant:	Alkalinity as CaCO3
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: 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:

Line of Evidence (LOE) for Decision ID 103987, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

111723

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 Mendocino Coast HU, Rockport HA, Ten Mile River HSA 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:

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 (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) (113PS0196)

Temporal Representation:

The samples were collected between the dates of 2012-08-01 and 2012-08-01

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 103987, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

116527

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 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) (113PS0132)

Temporal Representation:

The samples were collected between the dates of 2010-09-15 and 2010-09-15

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating 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	77689	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

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)(2016)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Decision name changed from "Nitrogen, ammonia (Total Ammonia)" to "Ammonia" 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 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 two 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:

Line of Evidence (LOE) for Decision ID 77689, Ammonia	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

102925

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 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:

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) (113PS0196)

Temporal Representation:

The samples were collected between the dates of 2012-08-01 and 2012-08-01

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 77689, Ammonia	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

111734

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:

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:

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) (113PS0132)

Temporal Representation:

The samples were collected between the dates of 2010-09-15 and 2010-09-15

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 77689, Ammonia	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

26321

Pollutant:

Ammonia as Nitrogen

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Freshwater Replenishment | Preservation of Rare & Endangered Species | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the 2 ammonia as nitrogen samples collected from the Ten Mile 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:

Samples were collected from the Ten Mile River (SWAMP Station ID 113TENNFK). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Samples were collected as grab samples during 2 site visits from May to June 2001.

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)


DECISION ID	104776	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

Pollutant:	Benthic Community Effects
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:	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. One of the two benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold but there are not other pollutants listed for impairment in this water body at this time. Additionally, habitat assessments indicate that the habitat in this water body is likely intact. More data should be collected to determine whether or not beneficial uses are fully supported.

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 104776, Benthic Community Effects	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

96485

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 0.775173454 & 0.891464668.

1 out of 2 of these scores exceeds the water quality objective and therefore, does not support the aquatic life beneficial use.

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:

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:

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:

These samples were collected at the following stations: 113PS0132 & 113PS0196

Temporal Representation:

These samples were collected on: 9/15/2010 & 8/1/2012

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. QAPP for SWAMP Perennial Stream Surveys.

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 104776, Benthic Community Effects	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

132797

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 water body had IPI scores of 1.1 and 1 which indicates the habitat is likely intact.

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:

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: 113PS0132 & 113PS0196

Temporal Representation:

These samples were collected on: 9/15/2010 & 8/1/2012

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols. QAPP for SWAMP Perennial Stream Surveys.

QAPP Information Reference(s):

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


DECISION ID	74002	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

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)(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. of the Listing Policy. Under section 3.2 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 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 two 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 26 samples is needed to determine if a beneficial use is fully supported using table 3.2. 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 74002, Chloride	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

117757

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:

Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s) (113PS0196)

Temporal Representation:

The samples were collected between the dates of 2012-08-01 and 2012-08-01

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 74002, Chloride	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

25437

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 2 chloride samples collected in the Ten Mile 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:

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 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:

Samples were collected from the Ten Mile River (SWAMP Station ID 113TENNFK). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Samples were collected as grab samples during 2 site visits from May to June 2001.

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 74002, Chloride	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

112109

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) (113PS0132)

Temporal Representation:

The samples were collected between the dates of 2010-09-15 and 2010-09-15

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating 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	104989	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

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:	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. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one sample from Ten Mile River and North Fork Ten Mile River exceed the objective for the protection of the MUN 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. Zero of one sample from Ten Mile River and North Fork Ten Mile River exceed the objective for the protection of the MUN 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:

Line of Evidence (LOE) for Decision ID 104989, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

112518

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:

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(s) (113PS0196)

Temporal Representation:

The samples were collected between the dates of 2012-08-01 and 2012-08-01

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 104989, Nitrate/Nitrite (Nitrite + Nitrate as N)	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

116538

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:

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) (113PS0132)

Temporal Representation:

The samples were collected between the dates of 2010-09-15 and 2010-09-15

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating 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	104990	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

Pollutant:	Nitrogen, Nitrite
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 is available in the administrative record to assess this pollutant. Zero of one sample from Ten Mile River exceeds the objective for the protection of the MUN 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. Zero of one sample from Ten Mile River exceeds the objective for the protection of the MUN 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:

Line of Evidence (LOE) for Decision ID 104990, Nitrogen, Nitrite	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

112507

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 Perennial Stream Surveys .

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) (113PS0132)

Temporal Representation:

The samples were collected between the dates of 2010-09-15 and 2010-09-15

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating 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	104606	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

Pollutant:	Oxygen, Dissolved
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 3.2 of the Listing Policy. Under section 3.2 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. Zero of one sample from Ten Mile River and North Fork Ten Mile River exceed the objective for the protection of the COLD 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. Zero of one sample from Ten Mile River and North Fork Ten Mile River exceed the objective for the protection of the COLD 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 26 samples is needed to determine if a beneficial use is fully supported using table 3.2. 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 104606, Oxygen, Dissolved	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

112496

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:

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 average of 8.0 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) (113PS0132)

Temporal Representation:

The samples were collected between the dates of 2010-09-15 and 2010-09-15

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 104606, Oxygen, Dissolved	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

101365

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 all present in the Ten Mile River watershed (USEPA 2000) . Spawning, incubation, and emergence occurs October through the June and rearing occurs year-round (CDFG 2004).

Guideline Reference:

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

Spatial Representation:

Information pertains to Mendocino Coast HU, Rockport HA, Ten Mile River HSA.

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 104606, Oxygen, Dissolved	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

104272

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) (113PS0196)

Temporal Representation:

The samples were collected between the dates of 2012-08-01 and 2012-08-01

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating 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	71738	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

Pollutant:	Specific Conductivity
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 3.2 of the Listing Policy. Under section 3.2 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. Zero of three samples from the Ten Mile River and Zero of one sample from the North Fork Ten Mile River exceed the objective for 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 three samples from the Ten Mile River and Zero of one sample from the North Fork Ten Mile River exceed the objective for MUN. 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 26 samples is needed to determine if a beneficial use is fully supported using table 3.2. 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 71738, Specific Conductivity	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

109564

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:

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:

Waters designated for use as domestic or municipal 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 (Water Quality Control Plan, North Coast Basin).

Objective/Criterion Reference:

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

Evaluation Guideline:

California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Basin Plan's \Chemical Constituents\" objective. The California Secondary MCL for specific conductivity is 900 uS/cm."

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(s) (113PS0132)

Temporal Representation:

The samples were collected between the dates of 2010-09-15 and 2010-09-15

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 71738, Specific Conductivity	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

21310

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 2 specific conductivity grab samples collected from the Ten Mile 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:

Per 22 CCR 64449: The recommended secondary Maximum Contaminant Level (MCL) is 900 uS/cm.

Guideline Reference:

Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations

Spatial Representation:

Samples were collected from the Ten Mile River (SWAMP Station ID 113TENNFK). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Samples were collected as grab samples during 2 site visits from May to June 2001.

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 71738, Specific Conductivity	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

116197

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:

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:

California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Basin Plan's \Chemical Constituents\" objective. The California Secondary MCL for specific conductivity is 900 uS/cm."

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(s) (113PS0196)

Temporal Representation:

The samples were collected between the dates of 2012-08-01 and 2012-08-01

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating 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	72960	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

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)(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 3.2 of the Listing Policy. Under section 3.2 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. 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 two 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 26 samples is needed to determine if a beneficial use is fully supported using table 3.2. 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 72960, Sulfates	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

115393

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 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) (113PS0132)

Temporal Representation:

The samples were collected between the dates of 2010-09-15 and 2010-09-15

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 72960, Sulfates	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

117559

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 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) (113PS0196)

Temporal Representation:

The samples were collected between the dates of 2012-08-01 and 2012-08-01

Environmental Conditions:

QAPP Information:

Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 72960, Sulfates	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

25546

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 2 sulfate samples collected in the Ten Mile 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:

Samples were collected from the Ten Mile River (SWAMP Station ID 113TENNFK). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Samples were collected as grab samples during 2 site visits from May to June 2001.

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	78560	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	Flow Alteration/Regulation/Modification \| Removal of Riparian Vegetation
Expected TMDL Completion Date:	2025
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.11 of the Listing Policy. Under this section when all other delisting factors do not result in the delisting of a water segment but information indicates attainment of standards, a water segment shall be evaluated to determine whether the weight of evidence demonstrates that water quality standard is attained. If the weight of evidence indicates attainment, the water segment shall be removed from the section 303(d) list. Eighteen lines of evidence are available in the administrative record. It should be noted that data from a ninteenth LOE from the 2006 Integrated Report (LOE 1688) were re-assessed during this listing cycle in LOEs 31648, 31646, 31644, and 31645. DELIST: Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing Mill Creek (LOE 31639), Gulch 11 (LOE 31636), Churchman Creek (LOE 31634), Little Bear Haven Creek (LOE 31637), Buckhorn Creek (LOE 31629), Booth Gulch (LOE 31628), Smith Creek (LOE 31643), Bear Haven Creek (LOE 31627), and the Little North Fork Ten Mile (LOE 31638) from the section 303(d) list for temperature. 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 following information indicates that the water quality standard is being attained: There were six to eighteen MWMTs calculated from near-continuous temperature monitoring data for each of the following creeks with no more than one exceedance: Gulch 11, Churchman Creek, Little Bear Haven Creek, Buckhorn Creek, Booth Gulch, Smith Creek, Bear Haven Creek, and the Little North Fork Ten Mile. Additionally, Mill Creek had only two exceedances out of 10 MWMTs. Data were collected during the warmest months of the year (May/June to October/November) in various years from 1994 to 2003. (3) This process is scientifically defensible and reproducible. DO NOT DELIST: Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing the remainder of this water body from the section 303(d) list for temperature. 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 following information indicates that the water quality standard is not attained: At least half of the MWMTs calculated from continuous temperature monitoring data collected in the South Fork Ten Mile River, Campbell Creek, Redwood Creek, the Middle Fork Ten Mile River (AKA the Clark Fork), and Bald Hill Creek during the warmest months of the year (May/June to October/November) exceeded the evaluation guideline used to interpret the narrative temperature objective. Each creek had eight to 53 MWMTs, with data collected in various years from 1994 to 2003 available to assess conditions. (3) This process is scientifically defensible and reproducible.

Regional Board Decision Recommendation:	This region was not assessed this cycle. All decisions have been carried over from the previous cycle and remain the same.

State Board Review of Regional Board Conclusion and Recommendation:	DELIST: Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing Mill Creek (LOE 31639), Gulch 11 (LOE 31636), Churchman Creek (LOE 31634), Little Bear Haven Creek (LOE 31637), Buckhorn Creek (LOE 31629), Booth Gulch (LOE 31628), Smith Creek (LOE 31643), Bear Haven Creek (LOE 31627), and the Little North Fork Ten Mile (LOE 31638) from the section 303(d) list for temperature. 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 following information indicates that the water quality standard is being attained: There were six to eighteen MWMTs calculated from near-continuous temperature monitoring data for each of the following creeks with no more than one exceedance: Gulch 11, Churchman Creek, Little Bear Haven Creek, Buckhorn Creek, Booth Gulch, Smith Creek, Bear Haven Creek, and the Little North Fork Ten Mile. Additionally, Mill Creek had only two exceedances out of 10 MWMTs. Data were collected during the warmest months of the year (May/June to October/November) in various years from 1994 to 2003. (3) This process is scientifically defensible and reproducible. DO NOT DELIST: Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing the remainder of this water body from the section 303(d) list for temperature. 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 following information indicates that the water quality standard is not attained: At least half of the MWMTs calculated from continuous temperature monitoring data collected in the South Fork Ten Mile River, Campbell Creek, Redwood Creek, the Middle Fork Ten Mile River (AKA the Clark Fork), and Bald Hill Creek during the warmest months of the year (May/June to October/November) exceeded the evaluation guideline used to interpret the narrative temperature objective. Each creek had eight to 53 MWMTs, with data collected in various years from 1994 to 2003 available to assess conditions. (3) This process is scientifically defensible and reproducible.

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 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31647

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:

None of the 4 MWMT values calculated from temperature data collected in Gulch 8 exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 15.4 to 15.9 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-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:

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

Evaluation Guideline:

If the natural receiving water temperature has been altered, or if alternation is unknown, the evaluation guideline to determine adverse affect on the most sensitive beneficial use (in this case, salmonids) is as follows. Per "U.S. EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards" (USEPA 2003), the U.S. EPA recommends a criterion for the protection of moderate to high density summertime salmon and trout juvenile rearing (i.e., core juvenile rearing) of a maximum weekly maximum temperature (MWMT) of 16 degrees C. The MWMT is also known as the maximum 7-day average of daily maximums (7DADM). The 16 degrees C MWMT criterion is recommended to (1) safely protect juvenile salmon and trout from lethal temperatures; (2) provide upper optimal conditions for juvenile growth under limited food during the period of summer maximum temperatures and optimal temperatures for other times of the growth season; (3) avoid temperatures where juvenile salmon and trout are at a competitive disadvantage with other fish; (4) protect against temperature induced elevated disease rates; and (5) provide temperatures that studies show juvenile salmon and trout prefer and are found in high densities.

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Gulch 8 at site NFT18.

Temporal Representation:

Continuous temperature data were collected from 2000-2003.

Environmental Conditions:

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

QAPP Information:

QA/QC information from 2006 was not available for this LOE update. The following language is copied from the original 2006 LOE 1687 QA/QC field. QA/QC Information Summary was submitted. Installation of the temperature data logger (Onset Computer Corp. model HOBO-Temp and OST temperature loggers in Class 1 streams throughout the property devices occurred one day before the first day logged on the continuous temperature monitoring figures. This was done to allow the data loggers to reach equilibrium with the instream temperature regimes and to capture complete daily cycles. No information on equipment calibration, standard operating procedures or data protocols were included with the submittal.

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31613

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:

Five of 10 MWMT values calculated from temperature data collected in Bald Hill Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 15.9 to 17.1 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Bald Hill Creek at site NFT2.

Temporal Representation:

Continuous temperature data were collected from 1994-2003.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31642

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:

Fourteen of 15 MWMT values calculated from temperature samples collected in Redwood Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 15.9 to 18.4 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Redwood Creek at sites SFT7 & SFT8.

Temporal Representation:

Continuous temperature data were collected at various sites/years between in 1994 & 2002.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

1688

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

41187

Number of Exceedances:

10776

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

When compared to the 14.8 °C coho threshold, there were 10,776 exceedances out of 41,187 total samples taken over all the sampling years at this location. When compared to the 17°C steelhead threshold there were 639 exceedances found (Hawthorne Timber Co., 2003).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Temperature objectives for COLD interstate waters, WARM interstate waters, and Enclosed Bays and Estuaries are as specified in the "Water Quality Control Plan for Control of Temperature in the Coastal and Interstate Waters and Enclosed Bays of California" including any revisions thereto. A copy of this plan is included verbatim in the Appendix Section of this Plan. In addition, the following temperature objectives apply to surface waters: The 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 by more than 5 F above natural receiving water temperature. At no time or place shall the temperature of WARM intrastate waters be increased more than 5 F above natural receiving water temperature.

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

The guideline used was from Sullivan et al. (2000) Published Temperature Thresholds-Peer Reviewed Literature which includes reviewed sub-lethal and acute temperature thresholds from a wide range of studies, incorporating information from laboratory-based research, field observations, and risk assessment approaches. This report calculated the 7-day Mean (maximum value of the 7-day moving average of the daily mean temperature) upper threshold criterion for coho salmon as 14.8°C and for steelhead trout as 17.0°C. The risk assessment approach used by Sullivan et al. (2000) suggests that an upper threshold for the for the 7-day average of 14.8°C for coho and 17.0°C for steelhead will reduce average growth 10% from optimum.

Guideline Reference:

Placeholder reference 2006 303(d)

Spatial Representation:

Data was collected from the North Fork, Clark Fork, South Fork and mainstem of the Ten Mile River. Sampling measurements were taken from a total of 54 instream sampling locations. Hobo-Temps were placed in the pools near the bottom and towards the deepest portion to record the in-stream temperatures. In stream and riparian measurements were taken at all monitoring locations.

Temporal Representation:

Data was recorded between 1994 and 2003. Water temperature data were recorded at 90-minute intervals, generally from June until Mid-October. Stream temperatures were measured continuously with temperature data loggers (Onset Computer Corp. model HOBO-Temp and OST temperature loggers) in Class 1 streams throughout the property from 1994 to 2003. Hobo-temps allowed uninterrupted data collection to occur throughout the critical summer period.

Environmental Conditions:

Mendocino Coast HU, Rockport HA, Ten Mile River HSA is currently listed for temperature. It was placed on the list during the 2002 listing cycle. The data showed that 31 out of the 37 locations exceeded the standards and uses of the Basin Plan Water Quality Objectives and Sullivan 2000 Published Temperature Thresholds-Peer Reviewed Literature.

QAPP Information:

QA/QC Information Summary was submitted. Installation of the temperature data logger (Onset Computer Corp. model HOBO-Temp and OST temperature loggers in Class 1 streams throughout the property devices occurred one day before the first day logged on the continuous temperature monitoring figures. This was done to allow the data loggers to reach equilibrium with the instream temperature regimes and to capture complete daily cycles. No information on equipment calibration, standard operating procedures or data protocols were included with the submittal.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31636

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:

One of 6 MWMT values calculated from temperature samples collected in Gulch 11 exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 14.1 to 16.2 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Gulch 11 at site SFT11.

Temporal Representation:

Continuous temperature data were collected in 1994, 1996, 1998 - 2001.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31634

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:

None of the 8 MWMT values calculated from temperature samples collected in Churchman Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 14.6 to 15.7 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Churchman Creek at site SFT4.

Temporal Representation:

Continuous temperature data were collected from 1994, 1996 - 2002.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31631

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:

Five of 8 MWMT values calculated from temperature samples collected in Campbell Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 15.0 to 17.7 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Campbell Creek at site SFT2.

Temporal Representation:

Continuous temperature data were collected in 1994 - 2001.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31641

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:

Six of 6 MWMT values calculated from temperature data collected in Patsy Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 16.3 to 17.4 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Patsy Creek at site NFT10.

Temporal Representation:

Continuous temperature data were collected from 1998-2003.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31645

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:

Thirty-seven of 44 MWMT values calculated from temperature data collected in the Middle Fork Ten Mile River (AKA Clark Fork) exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 15.0 to 20.0 degrees C. This LOE re-assesses some of the data from LOE 1688 from the 2006 Listing Cycle. In LOE 1688 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in the Middle Fork Ten Mile River (AKA Clark Fork) at sites CFT1, CFT2, CFG4, CFT8, CFT11, and CFT12.

Temporal Representation:

Continuous temperature data were collected at various sites/year during the period from 1994-2003.

Environmental Conditions:

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

QAPP Information:

QA/QC information from 2006 was not available for this LOE update. The following language is copied from the original 2006 LOE 1688 QA/QC field. QA/QC Information Summary was submitted. Installation of the temperature data logger (Onset Computer Corp. model HOBO-Temp and OST temperature loggers in Class 1 streams throughout the property devices occurred one day before the first day logged on the continuous temperature monitoring figures. This was done to allow the data loggers to reach equilibrium with the instream temperature regimes and to capture complete daily cycles. No information on equipment calibration, standard operating procedures or data protocols were included with the submittal.

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31646

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:

Forty-Four of 47 MWMT values calculated from temperature data collected in the North Fork Ten Mile River exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 14.9 to 21.0 degrees C. This LOE re-assesses some of the data from LOE 1688 from the 2006 Listing Cycle. In LOE 1688 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in the North Fork Ten Mile River at sites NFT1, NFT3, NFT4, NFT5, NFT9, and NFT 17.

Temporal Representation:

Continuous temperature data were collected in various sites/years from 1994-2003.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31644

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:

Six of 7 MWMT values calculated from temperature data collected in the mainstem of Ten Mile River exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 15.2 to 19.8 degrees C. This LOE re-assesses some of the data from LOE 1688 from the 2006 Listing Cycle. In LOE 1688 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in the mainstem of Ten Mile River at sites NFT 15 and TEN 2.

Temporal Representation:

Continuous temperature data were collected in 1996-2000 & 2002 at NFT 15 and in 2003 at TEN 2.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31648

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:

Thirty-eight of 53 MWMT values calculated from temperature data collected in the South Fork Ten Mile River exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 14.9 to 20.3 degrees C. This LOE re-assesses some of the data from LOE 1688 from the 2006 Listing Cycle. In LOE 1688 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in the South Fork Ten Mile River at sites SFT3, SFT5, SFT6, SFT9, SFT12, SFT19, SFT23, SFT24, SFT25, SFT26.

Temporal Representation:

Continuous temperature data were collected in various sites/years from 1994-2002.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31643

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:

One of 9 MWMT values calculated from temperature samples collected in Smith Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 14.7 to 16.9 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Smith Creek at site SFT1.

Temporal Representation:

Continuous temperature data were collected in 1994-1998 and 2000-2003.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31638

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:

One of 17 MWMT values calculated from temperature data collected in Little North Fork Ten Mile River exceeded the evaluation guideline for the protection of core-rearing. MWMT values ranged from 14.5 to 16.9 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in the Little North Fork Ten Mile River at sites NFT6 and NFT 8.

Temporal Representation:

Continuous temperature data were collected from 1994-2001.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31628

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:

One of 8 MWMT values calculated from temperature data collected in Booth Gulch exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 15.4 to 16.2 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Booth Gulch at site CFT5.

Temporal Representation:

.Continuous temperature data were collected during 1995-2001 and 2003.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31625

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 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:

Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The 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 by more than 5 F above natural receiving water temperature.

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): Water temperatures of the Mendocino Coast HU, Rockport HA, Ten Mile River HSA do not reflect natural conditions as environmental factors that influence water temperature have been altered by human activities. Examples of human alteration to the Ten Mile River include timber harvest which has altered sediment conditions in the river resulting in pool filling which can elevate stream temperatures (USEPA 2000). EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are all present in the Ten Mile River watershed (USEPA 2000) . Spawning, incubation, and emergence occurs October through the June and rearing occurs year-round (CDFG 2004).

Guideline Reference:

Ten Mile River Total Maximum Daily Load for Sediment.

Guideline Reference:

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

Spatial Representation:

Information pertains to Mendocino Coast HU, Rockport HA, Ten Mile River HSA.

Temporal Representation:

Data are reflective of current conditions in this water body.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31633

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:

None of the 4 MWMT values calculated from temperature samples collected in Center Fork Redwood Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 14.7 to 15.6 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in the Center Fork Redwood Creek at site SFT21.

Temporal Representation:

Continuous temperature data were collected from 1998, 1999, 2001, & 2002.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31640

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:

None of the 4 MWMT values calculated from temperature samples collected in North Fork Redwood Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 13.5 to 15.1 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in the North Fork Redwood Creek at site SFT20.

Temporal Representation:

Continuous temperature data were collected from 1998, 1999, 2001, & 2002.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31627

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:

None of the 18 MWMT values calculated from temperature data collected in Bear Haven Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 13.7 to 15.9 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Bear Haven Creek at sites CFT3 and CFT7.

Temporal Representation:

Continuous temperature data were collected in 1994-2001 at both sites and 2002-2003 at CFT7.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31629

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:

One of 6 MWMT values calculated from temperature data collected in Buckhorn Creek exceeded the evaluation guideline for the protection of core-rearing. MWMT values ranged from 12.8 to 20.9 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Buckhorn Creek at site NFT7.

Temporal Representation:

Continuous temperature data were collected from 1994-1999.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31637

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:

One of 9 MWMT values calculated from temperature data collected in Little Bear Haven Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 14.0 to 18.3 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Little Bear Haven Creek at site CFT6.

Temporal Representation:

Continuous temperature data were collected during 1994, 1995, and 1997-2003.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)

Line of Evidence (LOE) for Decision ID 78560, Temperature, water	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

31639

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:

Two of 10 MWMT values calculated from temperature data collected in Mill Creek exceed the evaluation guideline for the protection of core-rearing. MWMT values ranged from 13.1 to 18.6 degrees C. This LOE re-assesses some of the data from LOE 1687 from the 2006 Listing Cycle. In LOE 1687 the raw temperature data was incorrectly compared to the MWAT evaluation guideline, when in fact MWAT values should have been calculated from the raw data and compared to the MWAT evaluation guideline. For this listing cycle we are utilizing an MWMT evaluation guideline, instead of an MWAT, as it better captures temperature extremes. Additionally, LOE 1687 incorrectly included data from water bodies that are not coastal tributaries. Those data are now being assessed in the Mendocino Coast HU, Rockport HA, Ten Mile HSA water body.

Data Reference:

Instream temperature monitoring information: Usal Creek, Ten Mile River (north and south forks), Big River, Salmon Creek. Arcata, CA: Campbell Timberland Management

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.

Spatial Representation:

Continuous temperature data were collected in Mill Creek at site TEN1.

Temporal Representation:

Continuous temperature data were collected in 1994-2003.

Environmental Conditions:

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

QAPP Information:

QAPP Information Reference(s):

Placeholder reference 2006 303(d)


DECISION ID	72443	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the 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. None of the 2 lead samples exceed the water quality 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 section 303(d) list in the Water Quality Limited Segments category (i.e., sufficient justification to not 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 2 samples exceeded the lead objective, and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 16 samples, or (B) greater than or equal 2 exceedances of the objective with less than 16 samples is needed for application of 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:	This region was not assessed this cycle. All decisions have been carried over from the previous cycle and remain the same.

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 72443, Lead	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

21535

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:

None of the 2 lead samples collected in the Ten Mile River exceed the objectives. 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): Lead objective is 0.05 mg/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 Ten Mile River (SWAMP Station ID 113TENNFK). Samples were collected from well-mixed flows in glides or riffles.

Temporal Representation:

Samples were collected as grab samples during 2 site visits from May to June 2001.

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	70407	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

Pollutant:	Sedimentation/Siltation
Final Listing Decision:	List on 303(d) list (being addressed by 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:	Flow Alteration/Regulation/Modification \| Harvesting, Restoration, Residue Management \| Logging Road Construction/Maintenance \| Removal of Riparian Vegetation \| Silviculture
TMDL Name:	Ten Mile Sediment
TMDL Project Code:	111
Date TMDL Approved by USEPA:	12/01/2000
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 U.S. EPA established the Ten Mile River TMDL for Sediment in December 2000. 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 region was not assessed this cycle. All decisions have been carried over from the previous cycle and remain the same.

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 70407, Sedimentation/Siltation	Region 1
Mendocino Coast HU, Rockport HA, Ten Mile River HSA

LOE ID:

1689

Pollutant:

Sedimentation/Siltation

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:

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

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):