Final California 2012 Integrated Report( 303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name: Klamath River HU, Scott River HA
Water Body ID: CAR1054103519980707120412
Water Body Type: River & Stream
 
DECISION ID
20646
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Sedimentation/Siltation
Final Listing Decision: Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by USEPA approved TMDL)(2010)
Revision Status Revised
Sources: Erosion/Siltation | Flow Alteration/Regulation/Modification | Habitat Modification | Logging Road Construction/Maintenance | Other | Removal of Riparian Vegetation
TMDL Name: Scott River
TMDL Project Code: 106
Date TMDL Approved by USEPA: 09/08/2006
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: DELIST REFERENCE STREAMS:
The following streams are being proposed for delisting from the section 303(d) list for sedimentation/siltation under section 4.11 of the Listing Policy: (a) Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek (LOE 31559) and (b) Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness (LOE 31558).

The streams listed above are not significantly altered by anthropogenic activities and therefore, sediment conditions in these water bodies reflect natural conditions.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing (a) Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek and (b) Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness from the section 303(d) list for sedimentation/siltation. 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) Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek and Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness meet the criteria for reference water bodies and are not significantly altered by anthropogenic activities, which indicates attainment of sediment water quality objectives. (3) This process is scientifically defensible and reproducible.

DO NOT DELIST NON-REFERENCE STREAMS:
The remainder of this water body (non-reference streams) is being considered for removal from the section 303(d) list for sedimentation/siltation under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. One line of evidence for non-reference streams is available in the administrative record to assess this pollutant.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing the remainder of this water body (non-reference streams) from the section 303(d) list for sedimentation/siltation (i.e., sufficient justification to not delist). 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) 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 1654 is a placeholder for the 303(d) listing data and information from a previous assessment cycle that was initially utilized to make this listing determination. (4) Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that (1) Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek and (2) Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness should be removed from the section 303(d) list for sedimentation/siltation because applicable water quality standards for the pollutant are not being exceeded.

After review of the available data and information, RWQCB staff concludes that the remainder of this water body should not be removed from the section 303(d) list for sedimentation/siltation because applicable water quality standards for the pollutant are being exceeded.
 
State Board Staff 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 20646, Sedimentation/Siltation
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31559
 
Pollutant: Sediment
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Klamath River HU, Scott River HA, Scott Valley HSA, Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek water body meets the criteria for sediment reference water bodies and is not significantly altered by anthropogenic activities which indicates attainment of sediment water quality objectives.
Data Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect beneficial uses; waters shall not contain substances in concentrations that result in deposition of material that causes nuisance or adversely affects beneficial uses; and waters shall not contain suspended material in concentrations that cause nusance or adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Evidence of anthropogenic alterations to sediment conditions was assessed to determine compliance with the sediment water quality objectives. Sediment reference water bodies must meet the following criteria: 1) road density must be less than 0.19 km/km squared (0.30 mi/mi squared) with no significant failures (this road density value also signifies low past timber harvest intensity), 2) less than 10% of the drainage area is grazed and there are no Best Management Practices violations, and 3) mining activities have no significant sediment inputs. Water bodies with natural disturbance were included in the reference pool as a component of the natural variability in conditions.

Sediment conditions in the Klamath River HU, Scott River HA, Scott Valley HSA, Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek water body meet these criteria, reflect natural conditions, and are not significantly altered by anthropogenic activities as documented in the "Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan" (USFS 2010). Klamath National Forest (KNF) staff followed the State of California's Surface Water Ambient Monitoring Program guidance for screening and identifying reference water bodies (Ode 2009). Regional Water Board staff at the North Coast Region reviewed and approved the criteria that were developed by the KNF to identify sediment reference water bodies.
Guideline Reference: Recommendations for the development and maintenance of a reference condition management program (RCMP) to support biological assessment of California's wadeable streams. Report to the State Water Resources Control Board's Surface Water Ambient Monitoring Program (SWAMP). Technical Report 581.
  Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
 
Spatial Representation: Information pertains to Klamath River HU, Scott River HA, Scott Valley HSA, Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek.
Temporal Representation: Information is representative of current conditions in this water body.
Environmental Conditions:
QAPP Information: Process for identifying reference streams was reviewed and approved by staff and magement at the North Coast Regional Water Quality Control Board. Signed monitoring plan and QAPP provided.
QAPP Information Reference(s): QAPP portion of the Klamath National Forest Sediment and Temperature Monitoring Plan.
 
Line of Evidence (LOE) for Decision ID 20646, Sedimentation/Siltation
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 1654
 
Pollutant: Sedimentation/Siltation
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
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):
 
Line of Evidence (LOE) for Decision ID 20646, Sedimentation/Siltation
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31558
 
Pollutant: Sediment
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Klamath River HU, Scott River HA, Scott Bar HSA, Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness water body meets the criteria for sediment reference water bodies and is not significantly altered by anthropogenic activities which indicates attainment of sediment water quality objectives.
Data Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect beneficial uses; waters shall not contain substances in concentrations that result in deposition of material that causes nuisance or adversely affects beneficial uses; and waters shall not contain suspended material in concentrations that cause nusance or adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Evidence of anthropogenic alterations to sediment conditions was assessed to determine compliance with the sediment water quality objectives. Sediment reference water bodies must meet the following criteria: 1) road density must be less than 0.19 km/km squared (0.30 mi/mi squared) with no significant failures (this road density value also signifies low past timber harvest intensity), 2) less than 10% of the drainage area is grazed and there are no Best Management Practices violations, and 3) mining activities have no significant sediment inputs. Water bodies with natural disturbance were included in the reference pool as a component of the natural variability in conditions.

Sediment conditions in the Klamath River HU, Scott River HA, Scott Bar HSA, Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness water body meet these criteria, reflect natural conditions, and are not significantly altered by anthropogenic activities as documented in the "Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan" (USFS 2010). Klamath National Forest (KNF) staff followed the State of California's Surface Water Ambient Monitoring Program guidance for screening and identifying reference water bodies (Ode 2009). Regional Water Board staff at the North Coast Region reviewed and approved the criteria that were developed by the KNF to identify sediment reference water bodies.
Guideline Reference: Recommendations for the development and maintenance of a reference condition management program (RCMP) to support biological assessment of California's wadeable streams. Report to the State Water Resources Control Board's Surface Water Ambient Monitoring Program (SWAMP). Technical Report 581.
  Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
 
Spatial Representation: Information pertains to Klamath River HU, Scott River HA, Scott Bar HSA, Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness.
Temporal Representation: Information is representative of current conditions in this water body.
Environmental Conditions:
QAPP Information: Process for identifying reference streams was reviewed and approved by staff and magement at the North Coast Regional Water Quality Control Board. Signed monitoring plan and QAPP provided.
QAPP Information Reference(s): QAPP portion of the Klamath National Forest Sediment and Temperature Monitoring Plan.
 
 
DECISION ID
20647
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Temperature, water
Final Listing Decision: Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by USEPA approved TMDL)(2010)
Revision Status Revised
Sources: Agricultural Return Flows | Agricultural Water Diversion | Domestic Use of Ground Water | Flow Alteration/Regulation/Modification | Hydromodification | Other | Removal of Riparian Vegetation | Streambank Modification/Destabilization | Water Diversions
TMDL Name: Scott River
TMDL Project Code: 106
Date TMDL Approved by USEPA: 09/08/2006
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: DELIST REFERENCE STREAMS OUTSIDE QVIR:
The following streams are being proposed for delisting from the section 303(d) list for Temperature under section 4.11 of the Listing Policy: (a) Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek (LOE 31571) and (b) Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness (LOE 31554).

The streams listed above are temperature reference water bodies. Temperature reference water bodies are not significantly altered by anthropogenic activities and therefore, temperature conditions in these water bodies reflect natural conditions.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing (a) Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek and (b) Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness from the section 303(d) list for temperature. This conclusion is based on the staff findings that: (1) The data used satisfy the data quality requirements of section 6.1.4 of the Policy. (2) Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek and Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness meet the criteria for reference water bodies and are not significantly altered by anthropogenic activities and therefore, temperature conditions in these water bodies reflect natural conditions, which indicates attainment of the temperature water quality objective. (3) This process is scientifically defensible and reproducible.

DO NOT DELIST NON-REFERENCE STREAMS OUTSIDE QVIR:
The remainder of this water body (non-reference streams) is being considered for removal from the section 303(d) list for temperature under section 4.11 of the Listing Policy. The following lines of evidence are available in the administrative record to assess this pollutant in non-reference streams outside the Quartz Valley Indian Reservation (QVIR) boundary: Six lines of evidence for the mainstem Scott River three lines of evidence for Shackleford Creek; one line of evidence for Mill Creek, Thompkins Creek, Sugar Pine Creek, and Townsend Gulch; and one line of evidence describing temperature impairment conclusions from the Scott River TMDL for the entire Scott River watershed.

Three of three years of continuous temperature data for the mainstem Scott River (LOE 32948) reflect Maximum Weekly Maximum Temperatures (MWMTs) that violate the evaluation guideline. The Scott River TMDL (LOE 47442) confirms that anthropogenic alterations throughout the Scott River watershed have altered natural temperatures.

Grab sample data from Mill Creek (LOE 31797), Thompkins Gulch (LOE 31825), Sugar Pine (LOE 31824), Townsend Creek (LOE 31826), and the lower Scott River from Boulder Creek to the mouth (LOEs 31822, 43239, and 47573) have only 1-20 samples each and do not reflect any exceedances of the evaluation guideline. Seven of 100 grab samples from the middle mainstem Scott River from Youngs Dam to Boulder Creek (LOEs 47574 and 47575) and zero of 101 grab samples from Shackleford Creek outside the QVIR boundary (LOEs 34134, 31823, and 31820) exceed the evaluation guideline.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing the non-reference streams outside the QVIR boundary 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) Continuous temperature monitoring data in the mainstem Scott River confirms that temperatures are violating Basin Plan objectives. Additionally, the Scott River TMDL has confirmed temperatures in the Scott River HA do not reflect natural conditions. Although there are grab sample data for several streams which do not reflect exceedances of the evaluation guideline, these data are much less robust than continuous temperature monitoring data and do not indicate chronic temperature conditions which most affect the COLD beneficial use, including salmonids. (3) This process is scientifically defensible and reproducible.

STREAMS WITHIN QVIR:
Data for this pollutant are being evaluated utilizing the guidance under Section 4.11 of the Listing Policy.

The Scott River TMDL (LOE 47442) confirms that anthropogenic alterations throughout the Scott River watershed have altered natural temperatures. Zero of 24 grab samples from Snicktaw Creek within the QVIR boundary and zero of 88 grab samples from Shackleford Creek within the QVIR boundary exceed the evaluation guideline.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing the non-reference streams within the QVIR boundary 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 Scott River TMDL has confirmed temperatures in the Scott River HA do not reflect natural conditions. Although there are grab sample data for two streams which do not reflect exceedances of the evaluation guideline, these data do not indicate of chronic temperature conditions which most affect the COLD beneficial use, including salmonids. Therefore, the North Coast Regional Water Quality Control Board recommends that the USEPA not delist the portions of Snicktaw and Shackleford Creeks that are located on tribal land. (3) This process is scientifically defensible and reproducible.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that (1) Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek and (2) Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness should be removed from the section 303(d) list for temperature because applicable water quality standards for the pollutant are not being exceeded.

After review of the available data and information, RWQCB staff concludes that the remainder of this water body should not be removed from the section 303(d) list for temperature because applicable water quality standards for the pollutant are being exceeded.
 
State Board Staff Review of Regional Board Conclusion and Recommendation: Three of three years of continuous temperature data for the mainstem Scott River (LOE 32948) reflect Maximum Weekly Maximum Temperatures (MWMTs) that violate the evaluation guideline. The Scott River TMDL (LOE 47442) confirms that anthropogenic alterations throughout the Scott River watershed have altered natural temperatures.

Grab sample data from Mill Creek (LOE 31797), Thompkins Gulch (LOE 31825), Sugar Pine (LOE 31824), Townsend Creek (LOE 31826), and the lower Scott River from Boulder Creek to the mouth (LOEs 31822, 43239, and 47573) have only 1-20 samples each and do not reflect any exceedances of the evaluation guideline. Seven of 100 grab samples from the middle mainstem Scott River from Youngs Dam to Boulder Creek (LOEs 47574 and 47575) and zero of 101 grab samples from Shackleford Creek outside the QVIR boundary (LOEs 34134, 31823, and 31820) exceed the evaluation guideline.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing the non-reference streams outside the QVIR boundary 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) Continuous temperature monitoring data in the mainstem Scott River confirms that temperatures are violating Basin Plan objectives. Additionally, the Scott River TMDL has confirmed temperatures in the Scott River HA do not reflect natural conditions. Although there are grab sample data for several streams which do not reflect exceedances of the evaluation guideline, these data are much less robust than continuous temperature monitoring data and do not indicate chronic temperature conditions which most affect the COLD beneficial use, including salmonids. (3) This process is scientifically defensible and reproducible.

STREAMS WITHIN QVIR:
Data for this pollutant are being evaluated utilizing the guidance under Section 4.11 of the Listing Policy.

The Scott River TMDL (LOE 47442) confirms that anthropogenic alterations throughout the Scott River watershed have altered natural temperatures. Zero of 24 grab samples from Snicktaw Creek within the QVIR boundary and zero of 88 grab samples from Shackleford Creek within the QVIR boundary exceed the evaluation guideline.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing the non-reference streams within the QVIR boundary 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 Scott River TMDL has confirmed temperatures in the Scott River HA do not reflect natural conditions. Although there are grab sample data for two streams which do not reflect exceedances of the evaluation guideline, these data do not indicate of chronic temperature conditions which most affect the COLD beneficial use, including salmonids. Therefore, the North Coast Regional Water Quality Control Board recommends that the USEPA not delist the portions of Snicktaw and Shackleford Creeks that are located on tribal land. (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 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47575
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 26
Number of Exceedances: 2
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Two of 26 samples from the Scott River at Jones Beach exceeded the evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in the Scott River at SCJB (Scott @ Jones Beach USFS public beach access).
Temporal Representation: Grab samples were collected between 7/16/2008 and 8/19/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31509
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
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): 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: EVIDENCE OF ALTERATION OF NATURAL RECEIVING WATER TEMPERATURES (NON-NATURAL TEMPS): Water temperatures in most water bodies of the Scott River HA do not reflect natural conditions as environmental factors that influence water temperature have been altered by human activities as discussed in the Staff Report For the Action Plan for the Scott River Watershed Sediment and Temperature TMDLs (NCRWQCB 2005). EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Chinook, coho and steelhead are present in the watershed. Non-core rearing occurs in the mainstem Scott River year-round, and core rearing occurs in the tributaries to the Scott River year-round. Spawning, Incubation, and emergence occurs from September 16 to June 30th (NCRWQCB 2005).
Guideline Reference: Staff Report for the Action Plan for the Scott River Watershed Sediment and Temperature Total Maximum Daily Loads
 
Spatial Representation: Information pertains to the following water bodies: Klamath River HU, Scott River HA, mainstem Scott River; Klamath River HU, Scott River HA, select tributaries to Scott River; Klamath River HU, Scott River HA, Scott Bar HSA, Mill Creek and its Tributaries from the headwaters to the Scott River at Scott Bar; Klamath River HU, Scott River HA, Scott Bar HSA, Thompkins Creek and its Tributaries; Klamath River HU, Scott River HA, Scott Bar HSA, Kelsey Creek and its Tributaries; Klamath River HU, Scott River HA, Scott Bar HSA, Canyon Creek and its Tributaries from the downstream boundary of the Marble Mountain Wilderness to the confluence with the Scott River; Klamath River HU, Scott River HA, Scott Valley HSA, Shackleford Creek and its Tributaries; Klamath River HU, Scott River HA, Scott Valley HSA, South Fork Scott River and its Tributaries from the headwaters to the confluence with Jackson Creek; Klamath River HU, Scott River HA, Scott Valley HSA, Boulder Creek and its Tributaries from headwaters to confluence with the South Fork Scott River; Klamath River HU, Scott River HA, Scott Valley HSA, Grouse Creek and its Tributaries; Klamath River HU, Scott River HA, Scott Valley HSA, Sugar Creek and its Tributaries.
Temporal Representation: Information is representative of current conditions in these water bodies.
Environmental Conditions:
QAPP Information: Information is considered to be of adequate quality for the Integrated Report.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47573
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of 5 samples from the mainstem Scott River at Bridge Flat exceeded the evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in the Scott River at SCBF (Scott River @ Bridge Flat).
Temporal Representation: Grab samples were collected between 7/24/2008 and 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47442
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Staff Report for the Action Plan for the Scott River Watershed Sediment and Temperature Total Maximum Daily Loads concludes that human activities have resulted in significant increases in temperature in many areas of the Scott River watershed and small to mosest increases in other areas of the watershed. Regional Board Staff identified five factors influenced by human activities in the Scott River watershed that have affected, or have a potential to affect stream temperatures. The five factors are: stream shade, stream flow via surface diversion, stream flow via changes in groundwater accretion, channel geometry, and microclimate. The primary human-caused factor affecting stream temperatures in the Scott River watershed is increased solar radiation resulting from reductions of shade provided by riparian vegetation. Groundwater inflows are also a primary driver of stream temperatures in Scott Valley.
Data Reference: Staff Report for the Action Plan for the Scott River Watershed Sediment and Temperature Total Maximum Daily Loads
 
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:
Guideline Reference:
 
Spatial Representation: Information pertains to the Klamath River HU, Scott River HA.
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 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43239
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Water Temperature.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. 
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Per "Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids" (Carter 2008): The lethal temperature evaluation guideline for both steelhead adult migration & holding and juvenile growth & rearing of 24°C applies in this water body July - September 15. The lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C and applies September 16 - June in this water body. See LOE ID 31509 for more information on natural temperature alterations and salmonid presence and periodicity in this water body.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34134
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 34
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of thirty-four (34) samples exceeded the evaluation guideline. The sample values ranged from 4.3 degrees C to 17.0 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in Shackleford Creek at Shackleford Creek @ falls (SHFL).
Temporal Representation: Grab samples were collected from 5/29/2007 to 10/1/2007; 6/10/2008 to 10/29/2008; and 5/13/2009 to 10/28/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32948
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three of three MWMTs from the Scott River exceeded the evaluation guideline. MWMTs ranged from 24.4 degrees C to 27.5 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: Per "U.S. EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards" (USEPA 2003), the recommended criterion for the protection of moderate to low density summertime salmon and trout juvenile rearing (i.e., non-core juvenile rearing) of a maximum weekly maximum temperature (MWMT) of 18 C. The MWMT is also known as the maximum 7-day average of daily maximums (7DADM). The 18 C MWMT criterion is recommended to (1) safely protect against lethal conditions for both juveniles and adults; (2) prevent migration blockage conditions for migrating adults; (3) provide optimal or near optimal juvenile growth conditions (under limited food conditions) for much of the summer, except during the summer maximum conditions, which would be warmer than optimal; and (4) prevent adults and juveniles from high disease risk and minimize the exposure time to temperatures that can lead to elevated disease rates.
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 monitoring data was collected in the Scott River at the USGS Gage (SRGA).
Temporal Representation: Continous monitoring data was collected in 2007, 2008 & 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31826
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of one samples exceeded the evaluation guideline. The sample value was 18.4 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab sample was collected in Townsend Gulch at site SCTG.
Temporal Representation: Grab sample was collected on 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31825
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of one samples exceeded the evaluation guideline. The sample value was 17.8 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab sample was collected in Tompkins Creek at site SCTC.
Temporal Representation: Grab sample was collected on 8/19/2008..
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31824
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of one sample exceeded the evaluation guideline. The sample value was 19.2 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab sample was collected in Sugar Pine at site SCSP.
Temporal Representation: Grab sample was collected on 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2)
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31823
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 59
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of fifty-nine (59) samples exceeded the evaluation guideline. The sample values ranged from 4.1 degrees C to 21.4 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in Shackleford Creek at three locations below the Campbell Lake dam on non-tribal land: 1) Shackleford Creek @ Campbell Outlet (CAMO), 2) Shackleford Creek @ Summit Outlet (SUCC), and 3) Shackleford Creek @ trailhead (SHTH).
Temporal Representation: Grab samples were collected from 5/29/2007 to 10/1/2007; 6/10/2008 to 10/29/2008; and 5/13/2009 to 10/28/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31822
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of 1 samples from the Scott River at Gold Flat exceeds the evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in the Scott River at SCGF (Scott River @ Gold Flat).
Temporal Representation: The grab sample was collected on 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31821
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 24
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of twenty-four (24) samples exceeded the evaluation guideline. The sample values ranged from 6.4 degrees C to 19.3 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in Snicktaw Creek at site SNCR (Snicktaw Creek @ Res).
Temporal Representation: Grab samples were collected from 3/2/2009 to 10/14/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31820
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of eight samples exceeded the evaluation guideline. The sample values ranged from 4.8 degrees C to 17.8 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in Shackleford Creek above Campbell Lake at site CAMI (Campbell Lake Inlet).
Temporal Representation: Grab samples were collected on 5/29/2007 to 10/1/2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31798
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 88
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of eighty-eight (88) samples exceeded the evaluation guideline. The sample values ranged from 2.5 degrees C to 20.8 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in Shackleford Creek at two locations on tribal land: 1) Shackleford Creek @ QVIR (SRES), and 2) Shackleford Creek near mouth - lower Shackleford Creek (CHTH).
Temporal Representation: Grab samples were collected from 6/12/2007 to 10/1/2007; 1/16/2008 to 11/18/2008; and 1/6/2009 to 12/9/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31797
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 20
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of twenty (20) samples exceeded the evaluation guideline. The sample values ranged from 1.9 degrees C to 16.1 degrees C.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in Mill Creek (a tributary to Snicktaw Creek) at site MICR.
Temporal Representation: Grab samples were collected from 1/6/2009 to 10/28/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31571
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
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. The Klamath River HU, Scott River HA, Scott Valley HSA, Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Data Reference: Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.
  Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
 
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: EVIDENCE OF NATURAL RECEIVING WATER TEMPERATURE: The Klamath River HU, Scott River HA, Scott Valley HSA, Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek water body has been identified as a temperature reference water body in the "Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan" (USFS 2010). Klamath National Forest (KNF) staff followed the State of California's Surface Water Ambient Monitoring Program guidance for screening and identifying reference water bodies (Ode 2009). Regional Water Board staff at the North Coast Region reviewed and approved the criteria that were developed by the KNF to identify temperature reference water bodies. Temperature reference water bodies must meet the following criteria: 1) no evidence of human-caused reduction in stream shade is apparent in aerial photos, 2) road density must be less than 0.19 km/km squared (0.30 mi/mi squared) with no significant failures (this road density value also signifies low past timber harvest intensity), 3) less than 10% of the drainage area is grazed and there are no best management practice violations, and 4) mining activities have no significant sediment inputs. Water bodies with natural disturbance were included in the reference pool as a component of the natural variability in conditions. The Klamath River HU, Scott River HA, Scott Valley HSA, Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions..
Guideline Reference: Recommendations for the development and maintenance of a reference condition management program (RCMP) to support biological assessment of California's wadeable streams. Report to the State Water Resources Control Board's Surface Water Ambient Monitoring Program (SWAMP). Technical Report 581.
  Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
 
Spatial Representation: Information pertains to the Klamath River HU, Scott River HA, Scott Valley HSA, Mill Creek and its Tributaries from the headwaters to the confluence with Etna Creek.
Temporal Representation: Information is representative of current conditions in this waterbody.
Environmental Conditions:
QAPP Information: Process for identifying reference streams was reviewed and approved by staff and magement at the North Coast Regional Water Quality Control Board. Signed monitoring plan and QAPP provided.
QAPP Information Reference(s): QAPP portion of the Klamath National Forest Sediment and Temperature Monitoring Plan.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31554
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
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. The Klamath River HU, Scott River HA, Scott Bar HSA, Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Data Reference: Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.
  Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
 
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: EVIDENCE OF NATURAL RECEIVING WATER TEMPERATURE: The Klamath River HU, Scott River HA, Scott Bar HSA, Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness water body has been identified as a temperature reference water body in the "Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan" (USFS 2010). Klamath National Forest (KNF) staff followed the State of California's Surface Water Ambient Monitoring Program guidance for screening and identifying reference water bodies (Ode 2009). Regional Water Board staff at the North Coast Region reviewed and approved the criteria that were developed by the KNF to identify temperature reference water bodies. Temperature reference water bodies must meet the following criteria: 1) no evidence of human-caused reduction in stream shade is apparent in aerial photos, 2) road density must be less than 0.19 km/km squared (0.30 mi/mi squared) with no significant failures (this road density value also signifies low past timber harvest intensity), 3) less than 10% of the drainage area is grazed and there are no best management practice violations, and 4) mining activities have no significant sediment inputs. Water bodies with natural disturbance were included in the reference pool as a component of the natural variability in conditions. The Klamath River HU, Scott River HA, Scott Bar HSA, Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions..
Guideline Reference: Recommendations for the development and maintenance of a reference condition management program (RCMP) to support biological assessment of California's wadeable streams. Report to the State Water Resources Control Board's Surface Water Ambient Monitoring Program (SWAMP). Technical Report 581.
  Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
 
Spatial Representation: Information pertains to the Klamath River HU, Scott River HA, Scott Bar HSA, Canyon Creek and its Tributaries from the headwaters to the downstream boundary of the Marble Mountain Wilderness.
Temporal Representation: Information is representative of current conditions in this waterbody.
Environmental Conditions:
QAPP Information: Process for identifying reference streams was reviewed and approved by staff and magement at the North Coast Regional Water Quality Control Board. Signed monitoring plan and QAPP provided.
QAPP Information Reference(s): QAPP portion of the Klamath National Forest Sediment and Temperature Monitoring Plan.
 
Line of Evidence (LOE) for Decision ID 20647, Temperature, water
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47574
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 74
Number of Exceedances: 5
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Five of 74 samples from the Scott River at the USGS gage exceeded the evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
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: According to Carter (2008) the lethal threshold for steelhead adult migration & holding and juvenile growth & rearing is 24 degrees C. The lethal threshold for coho, steelhead, and Chinook spawning, incubation, & emergence is 20 degrees C.
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: Grab samples were collected in the Scott River at SRGA (Scott River @ USGS Gage).
Temporal Representation: Grab samples were collected between 1/16/2008 and 12/9/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
 
DECISION ID
29579
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Aldrin | Atrazine | Azinphos, Ethyl (Ethyl Guthion) | Azinphos-methyl (Guthion) | Bolstar | Carbofuran | Chlordane | Chlorothalonil | Chlorpyrifos | Chlorpyrifos, methyl | Ciodrin | DDD (Dichlorodiphenyldichloroethane) | DDE (Dichlorodiphenyldichloroethylene) | Dacthal | Demeton s | Diazinon | Dichlofenthion | Dichlorvos | Dieldrin | Dimethoate | Dioxathion | Dyfonate (Fonofos or Fonophos) | Endosulfan | Endosulfan sulfate | Endrin | Endrin Ketone | Endrin aldehyde | Ethion | Ethoprop | Famphur | Fenchlorphos | Fenitrothion | Fensulfothion | Fenthion | Glyphosate | Heptachlor | Heptachlor epoxide | Hexachlorobenzene/ HCB | Hexachlorocyclohexane (HCH), alpha | Hexachlorocyclohexane (HCH), beta | Leptophos | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | Malathion | Merphos | Methidathion | Methoxychlor | Methyl Parathion | Mevinphos | Mirex | Molinate | Naled | Nonylphenol | Oxadiazon | Oxychlordane | Parathion | Phorate | Phosmet | Phosphamidon | Prometon (Prometone) | Prometryn | Propazine | Secbumeton | Simazine | Simetryn | Sulfotep | Tedion | Terbufos | Terbuthylazine | Terbutryn | Tetrachlorvinphos | Thiobencarb/Bolero | Thionazin | Tokuthion | Toxaphene | Trichlorfon | Trichloronate | alpha-Endosulfan (Endosulfan 1) | beta-BHC (Benzenehexachloride or beta-HCH) | beta-Endosulfan (Endosulfan 2) | cis-Nonachlor | delta-BHC (Benzenehexachloride or delta-HCH) | o,p'-DDD (Dichlorodiphenyldichloroethane)) | o,p'-DDE (Dichlorodiphenyldichloroethylene) | p,p'-DDD (Dichlorodiphenyldichloroethane) | p,p'-DDE | p,p'-DDMU | trans-Nonachlor
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)(2010)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: These pollutants are 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. Thirty-five lines of evidence are available to assess protection of the cold freshwater habitat (COLD) beneficial use, twelve lines of evidence are available to assess protection of the commercial and sport fishing (COMM) beneficial use, and twenty-three lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use.

Per the Listing Policy, data from the following LOEs could not be evaluated because the laboratory data reporting limit(s) were above the objectives and therefore the results could not be quantified with the level of certainty required by the Listing Policy: (A)
LOEs 40924, 41753, 42307, and 42157 assessing the COMM beneficial use; (B) LOEs 40904, 33193, 34518, 34519, 41779, 42332, and 42207 assessing the MUN beneficial use; and (C) LOEs 41473, 41463, 42667, 42527, and 43021 assessing 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 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) Zero of 2,062 water samples exceed the MUN water quality objective, zero of 86 water samples exceed the COLD objective, and zero of 24 water samples exceed the COMM objective. These sample sizes do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Staff 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 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43420
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Simazine.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for simazine is 90 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42527
 
Pollutant: Mirex
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The criterion continuous concentration from the USEPA national ambient water quality criterion for the protection of freshwater aquatic life for mirex is 0.001 µg/L.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43193
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Thiobencarb.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for thiobencarb is 0.001 mg/L
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43170
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Thiobencarb.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for thiobencarb is 1.4 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43125
 
Pollutant: Methyl Parathion
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Parathion, Methyl.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The California Department of Fish and Game instantaneous criteria for Methyl Parathion is 0.08 ug/L.
Guideline Reference: Hazard Assessment of the Insecticide Methyl to Aquatic Organisms in the Sacramento River System
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43021
 
Pollutant: Parathion
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life 4-hour maximum for parathion is 0.013 µg/L.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43013
 
Pollutant: Nonylphenol
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Nonylphenol.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to nonylphenol is 6.6 ug/L.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42965
 
Pollutant: Prometon (Prometone)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Prometon.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometon is 98 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42957
 
Pollutant: Propazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Propazine.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for propazine is 1 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42955
 
Pollutant: Prometryn
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Prometryn.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for prometryn is 1 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42873
 
Pollutant: Phosmet
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Phosmet.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for phosmet is 5.6 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42841
 
Pollutant: Phorate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Phorate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for phorate is 2 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42703
 
Pollutant: Methidathion
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methidathion.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for methidathion is 0.86 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42667
 
Pollutant: Malathion
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The University of California, Davis, chronic criterion for the protection of freshwater aquatic life for malathion is 0.028 ug/L.
Guideline Reference: Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42604
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Molinate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for molinate is 0.02 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42553
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Molinate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for molinate is 0.6 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43311
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Simazine.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for simazine is 0.004 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42491
 
Pollutant: Methoxychlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methoxychlor.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64444-A for methoxychlor is 0.03 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42472
 
Pollutant: Methoxychlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Methoxychlor.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life instantaneous maximum for methoxychlor is 0.03 µg/L.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42380
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, gamma.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for HCH, gamma (Lindane or gamma-BHC) to protect aquatic life in freshwater criterion maximum concentration is 0.95 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42367
 
Pollutant: Heptachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Heptachlor.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42341
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, gamma.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42332
 
Pollutant: Heptachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect of human health from the consumption of water and organisms is 0.00021 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42316
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, gamma.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for gamma-BHC (Lindane, gamma-HCH) to protect human health from consumption of organisms only is 0.063 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42307
 
Pollutant: Heptachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor to protect human health from consumption of organisms only is 0.00021 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42207
 
Pollutant: Heptachlor epoxide
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect of human health from the consumption of water and organisms is 0.00010 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42172
 
Pollutant: Heptachlor epoxide
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Heptachlor epoxide.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect aquatic life in freshwater criterion continuous concentration (expressed as a 4-day average) is 0.0038 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42157
 
Pollutant: Heptachlor epoxide
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for heptachlor epoxide to protect human health from consumption of organisms only is 0.00011 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42128
 
Pollutant: Dyfonate (Fonofos or Fonophos)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Fonofos (Dyfonate).
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for fonofos is 0.45 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42062
 
Pollutant: Endrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.036 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42056
 
Pollutant: Endosulfan sulfate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endosulfan sulfate to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42049
 
Pollutant: Endrin aldehyde
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin Aldehyde.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42023
 
Pollutant: Endrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect of human health from the consumption of water and organisms is 0.76 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41998
 
Pollutant: Endrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41977
 
Pollutant: Endosulfan sulfate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA national ambient water quality criterion for freshwater aquatic life 24 hour average maximum for endodulfan sulfate is 0.056 µg/L.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41971
 
Pollutant: Hexachlorocyclohexane (HCH), alpha
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, alpha.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC (HCH, alpha) to protect human health from the consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41945
 
Pollutant: Hexachlorocyclohexane (HCH), beta
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, beta.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC (HCH, beta) to protect human health from consumption of organisms only is 0.046 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41934
 
Pollutant: Hexachlorocyclohexane (HCH), beta
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, beta.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-BHC (HCH, beta) to protect human health from the consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41912
 
Pollutant: Hexachlorocyclohexane (HCH), alpha
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for HCH, alpha.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-BHC (HCH, alpha) to protect human health from consumption of organisms only is 0.013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41874
 
Pollutant: Glyphosate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 2
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Glyphosate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for glyphosate is 700 ug/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 4/9/2008-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41855
 
Pollutant: Glyphosate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 2
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 2 samples exceed the criterion for Glyphosate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for glyphosate is 55000 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 4/9/2008-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41822
 
Pollutant: Endrin aldehyde
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endrin Aldehyde.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endrin aldehyde to protect human health from consumption of organisms only is 0.81ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41779
 
Pollutant: Dieldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect human health from the consumption of water and organisms is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41753
 
Pollutant: Dieldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41727
 
Pollutant: alpha-Endosulfan (Endosulfan 1)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan I.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41703
 
Pollutant: Dimethoate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dimethoate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for glyphosate is 43 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41612
 
Pollutant: Endosulfan sulfate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan sulfate.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for endosulfan sulfate to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41595
 
Pollutant: beta-Endosulfan (Endosulfan 2)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41589
 
Pollutant: beta-Endosulfan (Endosulfan 2)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41550
 
Pollutant: beta-Endosulfan (Endosulfan 2)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan II.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for beta-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41518
 
Pollutant: alpha-Endosulfan (Endosulfan 1)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan I.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protect of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41503
 
Pollutant: alpha-Endosulfan (Endosulfan 1)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Endosulfan I.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for alpha-endosulfan to protection of human health from consumption of organisms only is 240 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41492
 
Pollutant: Dieldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dieldrin.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for dieldrin to protect aquatic life in freshwater as criterion continuous concentration (expressed as a 4-day average) is 0.056 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41473
 
Pollutant: Azinphos-methyl (Guthion)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41470
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Atrazine.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life EC50 for atrazine is 43 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41463
 
Pollutant: Chlorpyrifos
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The freshwater criterion continuous concentration to protect aquatic organisms is 0.015 ug/L (Siepmann and Finlayson 2000, with minor corrections to significant figures as described in Beaulaurier et al., 2005).
Guideline Reference: Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game (with minor corrections to significant figures as described in Beaulaurier et al., 2005).
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41341
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Atrazine.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41287
 
Pollutant: Dichlorvos
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dichlorvos.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life MATC for dichlorvos is 7.2 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41253
 
Pollutant: Dacthal
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Dacthal.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to the USEPA Office of Pesticide Programs Ecotoxicity database, the freshwater aquatic life LC50 for dacthal 6600 ug/L.
Guideline Reference: OPP Pesticide Ecotoxicity Database.
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41243
 
Pollutant: Diazinon
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Diazinon.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: As stated in CDFG documents from Siepmann and Finlayson, the 4-day freshwater continuous criterion concentration for diazinon is 0.10 µg/L.
Guideline Reference: Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 40970
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Aldrin.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 40924
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 40904
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34519
 
Pollutant: DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDE criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).
Objective/Criterion Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples were collected on 11/15/2007, 4/9/2008, and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34518
 
Pollutant: DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4'-DDD criterion for the protection of human health from the consumption of water and organisms is 0.00031 ug/L (USEPA Nationally Recommended Criteria, 2006).
Objective/Criterion Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples were collected on 11/15/2007, 4/9/2008, and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33317
 
Pollutant: Chlordane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 3 samples exceeded the criterion continuous concentration for chlordane (total). Total chlordane is assessed as the sum of cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that 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 (NCRWQCB 2011). The chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH; Scott River near Klamath River
Temporal Representation: Samples collected between 11/15/2007 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33193
 
Pollutant: Chlordane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The method detection limit for all 3 of the non-detect samples was greater than the criteria and thus the data were not used in this assessment. Total chlordane is assessed as the sum of cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Basin Plan for the Regional Water Quality Control Board, North Coast Region states that 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 (NCRWQCB 2011). The total chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH; Scott River near Klamath River
Temporal Representation: Samples collected between 11/15/2007 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33140
 
Pollutant: Endosulfan
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 3 samples exceeded the criteria.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Water Quality Control Plan for the North Coast Region (NCRWQCB 2011): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. The endosulfan criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L. This value corresponds to the sum of alpha-endosulfan and beta-endosulfan (USEPA National Recommended Water Quality Criteria, 2006).
Objective/Criterion Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007, 4/9/2008, and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 30119
 
Pollutant: Aldrin | Atrazine | Carbofuran | Chlordane | Chlorpyrifos | Dacthal | Dieldrin | Endrin | Glyphosate | Heptachlor | Heptachlor epoxide | Hexachlorobenzene/ HCB | Hexachlorocyclohexane (HCH), alpha | Hexachlorocyclohexane (HCH), beta | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | Methoxychlor | Molinate | Simazine | Thiobencarb/Bolero | Toxaphene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 2021
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 2,021 pesticide samples collected in the Scott River exceed the objective as all of the samples were either measured as non-detect or were measured as detected but not quantified with reporting limits below objectives or evaluation guidelines. The samples were analyzed for 95 pesticides, pesticide constituents, isomers, or metabolites. For each of the 95 pesticide analytes, 4 to 15 samples were collected. 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): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.
No evaluation guidelines for the dissolved fractions of the pesticides assessed for this waterbody for the Municipal & Domestic Supply beneficial use could be found that meet the requirements of Section 6.1.3 of the Listing Policy.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: Hexachlorocyclohexane, alpha (0.0026 ug/l)
Hexachlorocyclohexane, beta (0.0091ug/l)
Aldrin (0.000049 ug/l)
Atrazine (0.001 ug/l)
Carbofuran (0.04 mg/l)
Chlordane (0.0001 ug/l)
Chlorpyrifos (0.083 ug/l)
Dacthal (70 ug/l)
Dieldrin (0.00014 ug/l)
Endrin (0.002 ug/l)
Glyphosate (700 ug/l)
Heptachlor (0.01 ug/l)
Heptachlor epoxide (0.01 ug/l)
Hexachlorobenzene/ HCB (0.001 ug/l)
Lindane/gamma Hexachlorocyclohexane (gamma-HCH) (.98 ug/l)
Methoxychlor (0.03 mg/l)
Molinate (0.02 mg/l)
Simazine (0.04 mg/l)
Thiobencarb/Bolero (0.07 mg/l)
Toxaphene (0.003 mg/l)
Guideline Reference: National recommended water quality criteria: 2002. EPA-822-R-02-047 Washington, D.C. USEPA
  Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
  California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring
 
Spatial Representation: Samples were collected from the mainstem Scott River from 3 locations as follows: (1) at Callahan (SWAMP Station ID 105SCOTCA), (2) at Jones Beach (SWAMP Station ID 105SCOTJB), and (3) near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. At the Jones Beach sites, samples were collected from May 2002 to June 2003. At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 29579, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 29848
 
Pollutant: Azinphos, Ethyl (Ethyl Guthion) | Bolstar | Carbofuran | Chlorothalonil | Chlorpyrifos, methyl | Ciodrin | Demeton s | Dichlofenthion | Dichlorvos | Dimethoate | Dioxathion | Dyfonate (Fonofos or Fonophos) | Endrin Ketone | Ethion | Ethoprop | Famphur | Fenchlorphos | Fenitrothion | Fensulfothion | Fenthion | Leptophos | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | Merphos | Methidathion | Methyl Parathion | Mevinphos | Naled | Oxadiazon | Oxychlordane | Phorate | Phosmet | Phosphamidon | Prometon (Prometone) | Prometryn | Propazine | Secbumeton | Simetryn | Sulfotep | Tedion | Terbufos | Terbuthylazine | Terbutryn | Tetrachlorvinphos | Thiobencarb/Bolero | Thionazin | Tokuthion | Trichlorfon | Trichloronate | beta-BHC (Benzenehexachloride or beta-HCH) | cis-Nonachlor | delta-BHC (Benzenehexachloride or delta-HCH) | o,p'-DDD (Dichlorodiphenyldichloroethane)) | o,p'-DDE (Dichlorodiphenyldichloroethylene) | p,p'-DDD (Dichlorodiphenyldichloroethane) | p,p'-DDE | p,p'-DDMU | trans-Nonachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 2021
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 2,021 pesticide samples collected in the Scott River exceed the objective as all of the samples were either measured as non-detect or were measured as detected but not quantified with reporting limits below objectives or evaluation guidelines. The samples were analyzed for 95 pesticides, pesticide constituents, isomers, or metabolites. For each of the 95 pesticide analytes, 4 to 15 samples were collected. 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): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.
No evaluation guidelines for the dissolved fractions of the pesticides assessed for this waterbody for the Municipal & Domestic Supply beneficial use could be found that meet the requirements of Section 6.1.3 of the Listing Policy.
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 mainstem Scott River from 3 locations as follows: (1) at Callahan (SWAMP Station ID 105SCOTCA), (2) at Jones Beach (SWAMP Station ID 105SCOTJB), and (3) near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles. .
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. At the Jones Beach sites, samples were collected from May 2002 to June 2003. At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):
 
 
DECISION ID
22815
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Arsenic | Boron | Cadmium | Chromium | Chromium (total) | Copper | Lead | Mercury | Nickel | Selenium | Silver | Zinc
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: These pollutants are 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. Eleven lines of evidence are available to assess protection of the municipal and domestic supply (MUN) beneficial use, nine lines of evidence are available to assess protection of the cold freshwater habitat (COLD) beneficial use, and two line of evidence is available to assess protection of the commercial and sport fishing (COMM) beneficial use.

Zero of 376 metals samples exceed the MUN water quality objective and zero of 34 metals samples exceed the COLD water quality objective. Additionally, zero of eight metals samples exceed the COMM water quality objective, however 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 to 2 exceedances of the COMM objective with less than 16 samples is needed for application of Table 3.1.

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) Zero of 376 metals samples exceed the MUN water quality objective and zero of 34 metals samples exceed the COLD water quality objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Staff 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 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43366
 
Pollutant: Selenium
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Selenium.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43257
 
Pollutant: Zinc
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Zinc.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Zinc is 5 mg/L.
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43333
 
Pollutant: Silver
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Silver.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for silver is 0.1 mg/L.
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43304
 
Pollutant: Selenium
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Selenium.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for selenium is 0.05 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43109
 
Pollutant: Nickel
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nickel.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nickel is 0.1 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 21511
 
Pollutant: Arsenic | Cadmium | Chromium (total) | Copper | Lead | Mercury | Nickel | Selenium | Silver | Zinc
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 336
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 336 metals samples collected in the Scott River exceed the objectives. For each of the 10 metal parameters, there were 8 samples of each collected at the Callahan site, 3 samples of each collected at the Fort Jones site, 6 samples of each collected at the Jones Beach site, and 16 to 17 samples of each collected at the site upstream of the Klamath River. 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): Arsenic objective is 0.05 mg/L. Cadmium objective is 0.01 mg/L. Chromium objective is 0.05 mg/L. Lead objective is 0.05 mg/L. Mercury objective is 0.002 mg/L. Selenium objective is 0.01 mg/L. Silver objective is 0.05 mg/L. Per 22 CCR 64431: Nickel maximum contaminant level is 0.1 mg/L. Per 22 CCR 64449: Copper secondary maximum contaminant level is 1.0 mg/L. Zinc secondary maximum contaminant level is 5.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
  Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River from 4 locations as follows: (1) at Callahan (SWAMP Station ID 105SCOTCA), (2) at Fort Jones (SWAMP Station ID 105SCOTFJ), (3) at Jones Beach (SWAMP Station ID 105SCOTJB), and (4) near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. At the Fort Jones sites, samples were collected from February 2002 to April 2002. At the Jones Beach sites, samples were collected from May 2002 to June 2003. At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32949
 
Pollutant: Cadmium
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for cadmium.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32950
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for copper.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32951
 
Pollutant: Lead
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for lead.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32952
 
Pollutant: Nickel
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for nickel.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32973
 
Pollutant: Silver
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for silver.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion maximum concentrations (1-hour average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32974
 
Pollutant: Zinc
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the hardness based criteria calculated for zinc.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. California Toxics Rule (CTR) lists criterion continuous concentrations (4-day average) to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34125
 
Pollutant: Boron
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 2
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of the 2 samples exceeded the objective.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The site specific objective for the Scott River HA is a 90% upper limit of 0.4 mg/L. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 0.1 mg/L which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the Scott River near Klamath River station (105SCOTSH).
Temporal Representation: Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41171
 
Pollutant: Chromium
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Chromium.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41206
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Copper.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41383
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Arsenic.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41456
 
Pollutant: Cadmium
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Cadmium.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42275
 
Pollutant: Lead
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Lead.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of values listed in Table 3-2 of the Basin Plan. The value for lead is 0.05 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42613
 
Pollutant: Nickel
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nickel.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for Nickel to protect human health from consumption of organisms only is 4.6 mg/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42669
 
Pollutant: Mercury
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of organisms only is 0.051 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42756
 
Pollutant: Mercury
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to Total mercury is 0.77 ug/L.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22815, Multiple Pollutants
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42719
 
Pollutant: Mercury
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Mercury.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for mercury to protect of human health from the consumption of water and organisms is 0.050 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
 
DECISION ID
24694
Region 1     
Klamath River HU, Scott River HA
 
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)(2010)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the Section 303(d) List under Section 3.2 of the Listing Policy. Under Section 3.2, a single line of evidence is necessary to assess listing status. Two lines of evidence (LOEs 34234 and 47554) are available to assess this pollutant in the lower mainstem Scott River near the Klamath River. Two lines of evidence (LOEs 47555 and 47556) are available to assess this pollutant in the middle mainstem Scott River at Jones Beach and at Fort Jones. One line of evidence (LOE 47557) is available to assess this pollutant in the upper mainstem Scott River at Callahan.

It should be noted that data from one additional LOE from the 2010 Integrated Report cycle (LOE 25415) have been re-assessed in LOEs 47554, 47555, 47556, and 47557.

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) One of 23 samples from the lower mainstem Scott River near the Klamath River, zero of 10 samples from the middle mainstem Scott River (Jones Beach and Fort Jones) and zero of 9 samples from the upper mainstem Scott River at Callahan exceed the evaluation guideline. These sample sizes are insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 26 samples, or (B) greater than or equal 5 exceedances of the objective with less than 26 samples is needed for application of 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 because applicable water quality standards are not being exceeded.
 
State Board Staff 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 24694, Chloride
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 25415
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 41
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 41 chloride samples collected in the Scott 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 mainstem Scott River from 4 locations as follows: (1) at Callahan (SWAMP Station ID 105SCOTCA), (2) at Fort Jones (SWAMP Station ID 105SCOTFJ), (3) at Jones Beach (SWAMP Station ID 105SCOTJB), and (4) near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. At the Fort Jones sites, samples were collected from February 2002 to April 2002. At the Jones Beach sites, samples were collected from May 2002 to June 2003. At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24694, Chloride
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47556
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 3 chloride samples collected in the Scott River at Fort Jones 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). This LOE and LOEs 47554, 47555, and 47557 replace LOE 25415 from the 2010 Integrated Report. The original LOE was replaced in order to evaluate data from each site in its own LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters 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) for the North Coast Region
 
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 mainstem Scott River at Fort Jones (SWAMP Station ID 105SCOTFJ). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Fort Jones site, samples were collected from February 2002 to April 2002. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24694, Chloride
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34234
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples collected exceeded the evaluation guideline.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
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 Scott River near Klamath River station (105SCOTSH).
Temporal Representation: Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 24694, Chloride
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47554
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 19
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 19 chloride samples collected in the Scott River near the Klamath 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). This LOE and LOEs 47555, 47556, and 47557 replace LOE 25415 from the 2010 Integrated Report. The original LOE was replaced in order to evaluate data from each site in its own LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters 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) for the North Coast Region
 
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 mainstem Scott River near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24694, Chloride
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47557
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 9 chloride samples collected in the Scott River at Callahan 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). This LOE and LOEs 47554, 47555, and 47556 replace LOE 25415 from the 2010 Integrated Report. The original LOE was replaced in order to evaluate data from each site in its own LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters 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) for the North Coast Region
 
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 mainstem Scott River at Callahan (SWAMP Station ID 105SCOTCA). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24694, Chloride
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47555
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 7 chloride samples collected in the Scott River at Jones Beach 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). This LOE and LOEs 47554, 47556, and 47557 replace LOE 25415 from the 2010 Integrated Report. The original LOE was replaced in order to evaluate data from each site in its own LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters 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) for the North Coast Region
 
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 mainstem Scott River at Jones Beach (SWAMP Station ID 105SCOTJB). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Jones Beach site, samples were collected from May 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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
28749
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
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)(2010)
Revision Status Revised
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 (LOE 34561) is available to assess protection of the cold freshwater habitat (COLD) beneficial use and two lines of evidence (LOEs 34517 and 47440) are available to assess protection of the municipal and domestic supply (MUN) beneficial use in the lower mainstem Scott River near the Klamath River. One line of evidence (LOE 47547) is available to assess protection of the municipal and domestic supply (MUN) beneficial use in the middle mainstem Scott River at Jones Beach. One line of evidence (LOE 47548) is available to assess protection of the municipal and domestic supply (MUN) beneficial use in the upper mainstem Scott River at Callahan.

The data in the MUN LOEs were all non-detect or detect-not-quantified and the reporting limit/detection limit was above the criteria, therefore in accordance with the listing policy the data were not used in this decision.

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) Zero of three samples from the lower mainstem Scott River near the Klamath River exceed the evaluation guideline for COLD, however 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: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
State Board Staff 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 28749, DDT (Dichlorodiphenyltrichloroethane)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47548
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Four DDT samples collected in the mainstem Scott River at Callahan were non-detect (ND). The reporting limit for all samples was greater than the criteria: thus the data were not used in this assessment. This LOE and LOEs 47440, and 47547 replace LOE 25615 from the 2010 Integrated Report cycle. The LOE was revsied to assess data for each site in its own LOE and to reflect that, per the Listing Policy (section 6.1.5.5), data below the reporting limit (ND data) shall not be used in the assessment.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). DDT, DDE, and DDD data from SWAMP Sampling for Years 2001-2006. North Coast Regional Water Quality Control Board.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The recommended criterion for DDT for the protection of source waters for human health consumption of water and organisms is 0.00022 ug/l.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected from the mainstem Scott River at Callahan (SWAMP Station ID 105SCOTCA). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 28749, DDT (Dichlorodiphenyltrichloroethane)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34516
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 3 samples exceeded the criterion continuous concentration for 4,4' DDT. The water body was assessed for the sum of DDT(o,p') and DDT(p,p').
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007, 4/9/2008, and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 28749, DDT (Dichlorodiphenyltrichloroethane)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47440
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Two DDT samples collected in the mainstem Scott River near the Klamath River had detect not quantified (DNQ) levels of DDT. There were also an additional 13 samples which were non-detect (ND). The reporting limit for all samples was greater than the criteria: thus the data were not used in this assessment. This LOE and LOEs 47547 and 47548 replace LOE 25615 from the 2010 Integrated Report cycle. The LOE was revsied to assess data for each site in its own LOE and to reflect that, per the Listing Policy (section 6.1.5.5), data below the reporting limit (DNQ and ND data) shall not be used in the assessment.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). DDT, DDE, and DDD data from SWAMP Sampling for Years 2001-2006. North Coast Regional Water Quality Control Board.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The recommended criterion for DDT for the protection of source waters for human health consumption of water and organisms is 0.00022 ug/l.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected from the mainstem Scott River near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: Samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 28749, DDT (Dichlorodiphenyltrichloroethane)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47547
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Four DDT samples collected in the mainstem Scott River at Jones Beach were non-detect (ND). The reporting limit for all samples was greater than the criteria: thus the data were not used in this assessment. This LOE and LOEs 47440, and 47548 replace LOE 25615 from the 2010 Integrated Report cycle. The LOE was revsied to assess data for each site in its own LOE and to reflect that, per the Listing Policy (section 6.1.5.5), data below the reporting limit (ND data) shall not be used in the assessment.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). DDT, DDE, and DDD data from SWAMP Sampling for Years 2001-2006. North Coast Regional Water Quality Control Board.
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. Waters designated for use as domestic or municipal supply shall not contain concentrations of pesticides in excess of the limiting concentrations set forth in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 4, Section 64444, and listed in Table 3.2 of the Basin Plan.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The recommended criterion for DDT for the protection of source waters for human health consumption of water and organisms is 0.00022 ug/l.
Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected from the mainstem Scott River at Jones Beach (SWAMP Station ID 105SCOTJB). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: Samples were collected from May 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 28749, DDT (Dichlorodiphenyltrichloroethane)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34517
 
Pollutant: DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The 4,4' DDT criterion for the protection of human health from the consumption of water and organisms is 0.00022 ug/L (USEPA Nationally Recommended Criteria, 2006).
Objective/Criterion Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples were collected on 11/15/2007, 4/9/2008, and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
 
DECISION ID
25200
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Hexachlorobenzene/ HCB
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)(2010)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: 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 (LOEs 42273 and 47441) are available to assess protection of the municipal and domestic supply (MUN) beneficial use and one line of evidence (42224) is available to assess protection of the commercial and sport fishing (COMM) beneficial use in the lower mainstem Scott River near the Klamath River. One line of evidence (LOE 47549) is available to assess protection of the municipal and domestic supply (MUN) beneficial use in the middle mainstem Scott River at Jones Beach. One line of evidence (LOE 47550) is available to assess protection of the municipal and domestic supply (MUN) beneficial use in the upper mainstem Scott River at Callahan.

It should be noted that LOEs 47441, 47549, and 47550 replace LOE 25616 from the 2010 Integrated Report cycle. Additionally, the pollutant name has been changed from “Pesticides” to “Hexachlorobenzene/HCB”.

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) Per the Listing Policy, non-detect and detect but not quantified (DNQ) data from the LOEs considered in this decision could not be evaluated because the laboratory data reporting limit(s) were above the criteria and therefore the results could not be quantified with the level of certainty required by the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
State Board Staff 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 25200, Hexachlorobenzene/ HCB
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47550
 
Pollutant: Hexachlorobenzene/ HCB
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The 4 samples from the Scott River at Callahan were all non-detect (with a reporting limit of 0.001 ug/L). Therefore the sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. 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). This LOE and LOEs 47441 and 47549 replace LOE 25616 from the 2010 Integrated Report. The original LOE was replaced in order to evaluate data from each site in its own LOE and to update the numeric criteria and reflect that ND and DNQ data could not be utilized in this assessment.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River at Callahan. Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 25200, Hexachlorobenzene/ HCB
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47549
 
Pollutant: Hexachlorobenzene/ HCB
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The 4 samples from the Scott River at Jones Beach were all non-detect (with a reporting limit of 0.001 ug/L). Therefore the sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. 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). This LOE and LOEs 47441 and 47550 replace LOE 25616 from the 2010 Integrated Report. The original LOE was replaced in order to evaluate data from each site in its own LOE and to update the numeric criteria and reflect that ND and DNQ data could not be utilized in this assessment.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River at Jones Beach. Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Jones Beach site, samples were collected from May 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 25200, Hexachlorobenzene/ HCB
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47441
 
Pollutant: Hexachlorobenzene/ HCB
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The 15 samples from the Scott River near the Klamath River were all non-detect (with a reporting limit of 0.001 ug/L) or detect but not quantified (DNQ). Therefore the sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy. 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). This LOE and LOEs 47549 and 47550 replace LOE 25616 from the 2010 Integrated Report. The original LOE was replaced in order to evaluate data from each site in its own LOE and to update the numeric criteria and reflect that ND and DNQ data could not be utilized in this assessment.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: Samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 25200, Hexachlorobenzene/ HCB
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42273
 
Pollutant: Hexachlorobenzene/ HCB
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 25200, Hexachlorobenzene/ HCB
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42224
 
Pollutant: Hexachlorobenzene/ HCB
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three non-detect sample results were not used in the assessment because the laboratory data reporting limit was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for hexachlorobenzene to protect human health from consumption of organisms only is 0.00077 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
 
DECISION ID
32001
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Indicator Bacteria
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: Fecal indicator bacteria (which includes Escherichia coli [E. Coli]) are being considered for placement on the Section 303(d) list under Section 3.2 and 3.3 of the Listing Policy. Under these sections a single line of evidence (LOE) is necessary to assess listing status. Sixteen lines of evidence for E. Coli are available in the administrative record to assess fecal indicator bacteria in water bodies where the State of California has the legal authority to regulate water quality: five for Shackleford Creek outside the Quartz Valley Indian Reservation (QVIR) boundary (LOEs 32030, 34040, 31905, 31904, and 31906), seven for the mainstem Scott River (LOEs 31902, 31958, 47576, 47577, 47578, 47579 and 47580), and one for each of Mill Creek (LOE 31901), Townsend Gulch (LOE 31910), Thompkins Creek (LOE 31909), and Sugar Pine (LOE 31908).

Four lines of evidence for E. Coli are available in the administrative record to assess fecal indicator bacteria in water bodies on the QVIR, over which the USEPA has the authority to regulate water quality: two for Shackleford Creek on QVIR land (LOEs 31956 and 31903), and two for Snicktaw Creek on QVIR land (LOEs 31959 and 31907). The LOEs containing data from the portion of water bodies that lie within the QVIR boundary are not utilized in this decision, as the State of California does not have the authority to list water bodies within the QVIR boundary. However, the USEPA has the jurisdiction to list water bodies on tribal land.

It should be noted that an additional ten LOEs assessing total coliform were not utilized in this decision as total coliform are widespread in nature and occur in non-fecal sources such as soil and submerged wood.

CONSIDERING LISTING WATER BODIES OUTSIDE THE QVIR BOUNDARY:
In accordance with Section 3.3 of the Listing Policy, a 4% exceedance rate shall be used to add waters to the List "if water quality monitoring was conducted April 1 through October 31 only". There was an insufficient sample size to determine with the power and confidence of the listing policy if the lower Scott River, Sugar Pine, Thompkins Creek, or Townsend Gulch should be listed, as there must be a minimum of either (A) 15 samples, or (B) greater than or equal 2 exceedances of the objective with less than 15 samples is needed for application of the 4% exceedance rate under Section 3.3. Zero of 95 single sample maximum E. Coli samples from Shackleford Creek outside the QVIR boundary were above the evaluation guideline and this did not exceed the allowable 4% exceedance rate of greater than or equal to 10 exceedances out of 95 samples.

Data collected from Mill Creek and the middle Scott River from Youngs Dam to Boulder Ck. were collected including months outside the April 1 through October 31 range, and therefore are assessed under Section 3.2 of the Listing Policy at a 10% exceedance rate. There were not enough E. Coli samples from Mill Creek to determine with the power and confidence of the Listing Policy if standards are not met under Section 3.2 as there must be a minimum of either (A) 26 samples, or (B) greater than or equal 5 exceedances of the objective with less than 26 samples is needed for application of Table 3.2. Five of 89 single sample maximum values and 0 of 50 geometric means calculated from the E. Coli samples from the middle Scott River were above the evaluation guideline and this did not exceed the allowable 10% exceedance rates of greater than or equal to 15 exceedance out of 89 samples and greater than or equal to 9 of 50 samples.

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 to the Section 303(d) list (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfy the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfy the data quantity requirements of Section 6.1.5 of the Policy. (3) The single sample maximum E. Coli samples from Shackleford Creek outside the QVIR boundary did not exceed the allowable 4% exceedance rate. The single sampes and geometric mean data for E. Coli from the middle Scott River from Youngs Dam to Boulder Ck. did not exceed the allowable 10% exceedance rate. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

CONSIDERATION OF THE DATA FROM WITHIN THE QVIR BOUNDARY:
In accordance with Section 3.3 of the Listing Policy, a 4% exceedance rate shall be used to add waters to the List "if water quality monitoring was conducted April 1 through October 31 only". However, the data for Shackleford Creek on QVIR land and Snicktaw Creek on QVIR land include data collected during months outside the April – October range. Therefore, the data are considered under section 3.2 of the Listing Policy, using a 10% exceedance rate.

Thirteen of 13 single sample maximum values and 12 of 27 geometric mean values calculated from the E. Coli samples from Snicktaw Creek on QVIR land were above the evaluation guideline, and these values exceed the allowable 10% exceedance rate listed in Table 3.2 of the Listing Policy. Additionally, 6 of 22 geometric mean values calculated form E. Coli samples from Shackleford Creek on QVIR land exceed the evaluation guideline and this exceeds the allowable 10% exceedance rate from Table 3.2. Therefore, the North Coast Regional Water Quality Control Board recommends that the USEPA list the portion of these water bodies that are located on tribal land on the 303(d) List for Indicator Bacteria. It should be noted, as stated above, that the available data for Shackleford Creek and Snicktaw Creek from outside the QVIR boundary do not reflect impairment.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the portions of this water body that are outside the Quartz Valley Indian Reservation boundary should not be placed on the section 303(d) list for indicator bacteria because applicable water quality standards are not being exceeded.

The North Coast Regional Water Quality Control Board recommends that the USEPA list (1) Shackleford Creek on QVIR land and (2) Snicktaw Creek on QVIR land on the 303(d) List for Indicator Bacteria because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. It should be noted that the data for Shackleford Creek and Snicktaw Creek from outside the QVIR boundary do not reflect impairment.
 
State Board Staff Review of Regional Board Conclusion and Recommendation: 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 to the Section 303(d) list (i.e., sufficient justification to not list). This conclusion is based on the staff findings that: (1) The data used satisfy the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfy the data quantity requirements of Section 6.1.5 of the Policy. (3) The single sample maximum E. Coli samples from Shackleford Creek outside the QVIR boundary did not exceed the allowable 4% exceedance rate. The single sampes and geometric mean data for E. Coli from the middle Scott River from Youngs Dam to Boulder Ck. did not exceed the allowable 10% exceedance rate. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

CONSIDERATION OF THE DATA FROM WITHIN THE QVIR BOUNDARY:
In accordance with Section 3.3 of the Listing Policy, a 4% exceedance rate shall be used to add waters to the List "if water quality monitoring was conducted April 1 through October 31 only". However, the data for Shackleford Creek on QVIR land and Snicktaw Creek on QVIR land include data collected during months outside the April – October range. Therefore, the data are considered under section 3.2 of the Listing Policy, using a 10% exceedance rate.

Thirteen of 13 single sample maximum values and 12 of 27 geometric mean values calculated from the E. Coli samples from Snicktaw Creek on QVIR land were above the evaluation guideline, and these values exceed the allowable 10% exceedance rate listed in Table 3.2 of the Listing Policy. Additionally, 6 of 22 geometric mean values calculated form E. Coli samples from Shackleford Creek on QVIR land exceed the evaluation guideline and this exceeds the allowable 10% exceedance rate from Table 3.2. Therefore, the North Coast Regional Water Quality Control Board recommends that the USEPA list the portion of these water bodies that are located on tribal land on the 303(d) List for Indicator Bacteria. It should be noted, as stated above, that the available data for Shackleford Creek and Snicktaw Creek from outside the QVIR boundary do not reflect impairment.
 
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 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47576
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 35
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of 35 geometric means calculated from data for the Scott River at the USGS gage exceeded the gemetric mean objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when the geometric mean of E. coli samples exceed 126 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at SRGA Scott River @ USGS Gage.
Temporal Representation: Samples were collected between January 2008 and December 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31896
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 66
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the sixty-six samples exceeded the water quality objective for Total Coliform.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample Total Coliform levels exceed 10000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Shackleford near mouth-lower Shackleford (CHTH) and Shackleford at QVIR site (SRES).
Temporal Representation: Samples were collected between June 2008 and December 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31897
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the one (1) samples exceeded the water quality objective for Total Coliform.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample Total Coliform levels exceed 10000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Townsend Gulch (SCTG).
Temporal Representation: Samples was collected on 10/14/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31901
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 19
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: None of the 19 samples exceed the water quality objective for E. coli. All of the samples were collected from site MICR.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at the Mill Creek location.
Temporal Representation: Samples were collected between January 2009 to October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31902
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the 5 samples from the Scott River at Bridge Flat exceed the water quality objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Scott River at Bridget Flat.
Temporal Representation: Samples were collected between July 2008 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31903
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 96
Number of Exceedances: 5
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Five of the ninety-six samples exceeded the water quality objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at rwo locations on the Quartz Valley Indian Reservation - Lower Shackleford (CHTH) and Shackleford at QVIR (SRES).
Temporal Representation: Samples were collected between May 2007 and December 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31904
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the eight (8) samples exceeded the water quality objective for E. coli. All 8 samples were taken from the CAMI site.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Shackleford Creek above Campbell Lake.
Temporal Representation: Samples were collected between May 2007 and October 2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31905
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the ten (10) samples exceeded the water quality objective for E. coli. All 10 samples were taken from the CAMO site.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Shackleford Creek below Campbell outlet.
Temporal Representation: Samples were collected between May 2007 and October 2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31906
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the ten (10) samples exceeded the water quality objective for E. coli. All 10 samples were taken from the SUCC site.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected from Shackleford Creek below Summit Meadow Lake Outlet.
Temporal Representation: Samples were collected between May 2007 and October 2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31907
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 27
Number of Exceedances: 12
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Twelve of the twenty-seven samples exceeded the water quality objective for E. coli. Samples were collected at SNCK, SNCK(2), and SNCR, which are all names for the same sampling location.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Snicktaw Creek.
Temporal Representation: Samples were collected between June 2008 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31908
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the one (1) sample exceeded the water quality objective for E. coli. The sample was taken from the SCSP site.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Sugar Pine Creek.
Temporal Representation: Samples were collected in August 2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31909
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the one (1) sample exceeded the water quality objective for E. coli. The sample was taken from the SCTC site.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Tompkins Creek.
Temporal Representation: Samples were collected in August 2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47580
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 65
Number of Exceedances: 4
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Four of the 65 samples from the Scott River at the USGS gage exceed the water quality objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Scott Riverat USGS Gage.
Temporal Representation: Samples were collected between January 2008 and December 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47579
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 24
Number of Exceedances: 1
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: One of the 24 samples from the Scott River at Jones Beach exceed the water quality objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Scott River at Jones Beach.
Temporal Representation: Samples were collected between July 2008 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47578
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of 1 sample from the Scott River at Gold Flat exceeds the water quality objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Scott River at Gold Flat.
Temporal Representation: Sample was collected August 19, 2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47577
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of 1 geometric mean calculated from data for the Scott River at Bridge Flat exceeded the gemetric mean objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when the geometric mean of E. coli samples exceed 126 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at SCBF Scott River @ Bridge Flat.
Temporal Representation: Samples were collected 7/24/2008 to 10/14/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34051
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the thirteen samples exceeded the water quality objective for total coliform.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample Total Coliform levels exceed 10000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Shackleford at Falls (SHFL).
Temporal Representation: Samples were collected between May 2009 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34040
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 33
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the thirty-three samples exceeded the water quality objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Shackleford at Trailhead (SHTH).
Temporal Representation: Samples were collected between May 2007 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32031
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the thirteen samples exceeded the water quality objective for total coliform.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample Total Coliform levels exceed 10000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Shackleford at Trailhead (SHTH).
Temporal Representation: Samples were collected between May 2009 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32030
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 34
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the thirty-four samples exceeded the water quality objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Shackleford at Falls (SHFL).
Temporal Representation: Samples were collected between May 2007 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31959
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 13
Number of Exceedances: 13
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Thirteen of the thirteen samples exceeded the gemetric mean objective for E. coli. The samples were collected from the Snicktaw Creek area and all of the geomeans were from site SNCR.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when the geometric mean of E. coli samples exceed 126 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at site SNCR Sniktaw Creek@Rez.
Temporal Representation: Samples were collected between May 2007 and June 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31958
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 15
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of 15 geometric means calculated from data for the Scott River at Jones Beach exceeded the gemetric mean objective for E. coli.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when the geometric mean of E. coli samples exceed 126 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at SCJB Scott @ Jones Beach USFS public beach access.
Temporal Representation: Samples were collected between July 2008 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31956
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 22
Number of Exceedances: 6
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Six of the twenty-two samples exceeded the gemetric mean objective for E. coli. The samples were collected from the Shackleford Creek area and 20 of the geomeans were taken from site CHTH and 2 from SRES.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when the geometric mean of E. coli samples exceed 126 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Scott River near mouth - Lower Shackleford (CHTH) and Shackleford at QVIR (SRES).
Temporal Representation: Samples were collected between May 2007 and June 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31924
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 25
Number of Exceedances: 22
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Twenty-two of the 25 samples exceeded the gemetric mean objective for total coliform. The samples were collected from the Scott River area.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when the geometric mean of total coliform samples exceed 1000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at site SCJB Scott @ Jones Beach USFS public beach access, SRGA Scott River @ USGS Gage, and SCBF Scott River @ Bridge Flat.
Temporal Representation: Samples were collected between May 2007 and June 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31923
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 13
Number of Exceedances: 13
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Thirteen of the thirteen samples exceeded the gemetric mean objective for total coliform. The samples were collected from the Shackleford Creek area.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when the geometric mean of total coliform samples exceed 1000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at site CHTH Shackleford near mouth-Lower Shackleford and SRES Shackleford @ QVIR.
Temporal Representation: Samples were collected between May 2007 and June 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31922
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 12
Number of Exceedances: 12
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Twelve of the twelve samples exceeded the gemetric mean objective for total coliform. The samples were collected from the Snicktaw Creek area and all of the geomeans were from site SNCR.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when the geometric mean of total coliform samples exceed 1000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at site SNCR Sniktaw Creek@Rez.
Temporal Representation: Samples were collected between May 2007 and June 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31913
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 24
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the twenty four (24) samples exceeded the water quality objective for Total Coliform. The samples were taken from SNCK, SNCR, and SNCK(2) which are all names for the same sampling location.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample Total Coliform levels exceed 10000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Sniktaw Creek.
Temporal Representation: Samples were collected between June 2008 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31912
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 60
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the sixty (60) samples exceeded the water quality objective for Total Coliform. The samples was taken from the SCJB site, SRGA site, SCRX site and SCBF site.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample Total Coliform levels exceed 10000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Scott River at Jones Beach, Scott River at USGS Gage, Scott river at Roxbury Bridge and Scott River at Bridge Flat.
Temporal Representation: Samples were collected between July 2008 and December 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31911
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 19
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the nineteen (19) samples exceeded the water quality objective for Total Coliform. The samples was taken from the MICR site.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample Total Coliform levels exceed 10000 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Mill Creek.
Temporal Representation: Samples were collected between January 2009 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
Line of Evidence (LOE) for Decision ID 32001, Indicator Bacteria
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 31910
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 2
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero (0) of the two (2) samples exceeded the water quality objective for E. coli. The samples was taken from the SCTG site.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The bacteriological quality of waters of the North Coast Region shall not be degraded beyond natural background levels.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Draft Guidance for Fresh Water Beaches" (CDPH 2011): Beach posting is recommended when single sample E. coli levels exceed 235 MPN / 100 ml.
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: Samples were collected at Townsend Gulch.
Temporal Representation: Samples were collected in August 2008 and October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis. Samples were collected according to the Standards Operating Procedure for: Escherichia coli and Total Coliform using the IDEXX Quanti-Tray/2000 System with Colilert Reagent.
QAPP Information Reference(s): Standard Operating Procedure for: Escherichia coli and Total Coliform using IDEXX Quanti-Tray/2000 System with Colilert Reagent. QVIR Environmental Protection Department.
 
 
DECISION ID
32294
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Manganese
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 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 to assess protection of the municipal and domestic supply (MUN) beneficial use in the lower mainstem Scott River from Boulder Creek to the mouth.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing the lower mainstem Scott River from Boulder Creek to the mouth on the section 303(d) list in the Water Quality Limited Segments category for manganese (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) One of four samples from the lower mainstem Scott River from Boulder Creek to the mouth exceed the 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: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
 
State Board Staff 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 32294, Manganese
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 42773
 
Pollutant: Manganese
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 1 of 4 samples exceed the criterion for Manganese.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Manganese is 0.05 mg/L.
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
 
DECISION ID
31989
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Nitrate
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: One line of evidence is available in the administrative record to assess this pollutant in the middle mainstem Scott River from Youngs Dam to Boulder Creek (LOE 32812) where the State of California has the legal authority to regulate water quality.

One line of evidence is available in the administrative record to assess this pollutant in Shackleford Creek on the Quartz Valley Indian Reservation (QVIR), over which the USEPA has the authority to regulate water quality (LOE 32811). The LOE for Shackleford Creek containing data from the portion of the creek that lies within the QVIR boundary is not utilized in this decision, as the State of California does not have the authority to list water bodies within the QVIR boundary. However, the data are discussed for the benefit of the USEPA, which has the jurisdiction to list water bodies on tribal land.

CONSIDERING LISTING WATER BODIES OUTSIDE THE QVIR BOUNDARY:
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.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing the middle mainstem Scott River from Youngs Dam to Boulder Creek on the section 303(d) list in the Water Quality Limited Segments category for nitrate (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) Zero of 1 sample from the middle mainstem Scott River from Youngs Dam to Boulder Creek exceeds the MUN objective, however this sample size is insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 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.

CONSIDERATION OF THE DATA FROM WITHIN THE QVIR BOUNDARY:
Data for this pollutant are being evaluated utilizing the guidance under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against USEPA 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) Zero of 1 sample from Shackleford Creek within the QVIR boundary exceeds the MUN objective, however this sample size is insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 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: After review of the available data and information, RWQCB staff concludes that the portions of this water body that are outside the Quartz Valley Indian Reservation boundary should not be placed on the section 303(d) list for Nitrate because it cannot be determined if applicable water quality standards are not being exceeded.
 
State Board Staff 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 31989, Nitrate
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32812
 
Pollutant: Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The sample did not exceed the water quality objective for nitrate. The Nitrate MCL objective is 45 mg/L as NO3.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the Minimum Contamination Level(MCL) specified in Title 22, Division 4, Chapter 15, Article 4, Sections 64435 (Tables 2 and 3) and 64444.5 (Table 5) of the California Code of Regulations. The Nitrate (as N03) MCL is 45 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Sample was collected at Scott River @ USGS Gage.
Temporal Representation: Samples were collected 04/29/2009.
Environmental Conditions:
QAPP Information: The Quartz Valley Indian Reservation submitted a signed QAPP.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 31989, Nitrate
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32811
 
Pollutant: Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the samples exceed the water quality objective for nitrate. The nitrate MCL objective is 45 mg/L Nitrate as N03.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (2011): Waters designated for MUN shall not contain concentrations of chemical constituents in excess of the Minimum Contamination Level(MCL) specified in Title 22, Division 4, Chapter 15, Article 4, Sections 64435 (Tables 2 and 3) and 64444.5 (Table 5) of the California Code of Regulations. The Nitrate (as N03) MCL is 45 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Shackleford near mouth -Lower Shackleford.
Temporal Representation: Samples were collected 04/29/2009. Samples were collected on the same day at the same site and were thus averaged.
Environmental Conditions:
QAPP Information: The Quail Valley Indian Reservation submitted a signed QAPP.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
 
DECISION ID
32000
Region 1     
Klamath River HU, Scott River HA
 
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: Four lines of evidence are available in the administrative record to assess this pollutant in water bodies where the State of California has the legal authority to regulate water quality: one for Shackleford Creek outside the Quartz Valley Indian Reservation (QVIR) boundary (LOE 46492), two for the mainstem Scott River (LOEs 46491 and 43050), and one for Mill Creek (46490).

Two lines of evidence are available in the administrative record to assess this pollutant in water bodies on the QVIR, over which the USEPA has the authority to regulate water quality: one for Shackleford Creek on QVIR land (LOE 46493) and one for Snicktaw Creek on QVIR land (LOE 46494).

The LOEs containing data from the portion of water bodies that lie within the QVIR boundary are not utilized in this decision, as the State of California does not have the authority to list water bodies within the QVIR boundary. However, the data is discussed for the benefit of the USEPA, which has the jurisdiction to list water bodies on tribal land.

CONSIDERING LISTING WATER BODIES OUTSIDE THE QVIR BOUNDARY:
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.

Zero of 24 samples from Shackleford creek outside the QVIR boundary exceed the MUN water quality objective.

Zero of 12 samples from the middle mainstem Scott River from Youngs Dam to Boulder Creek, zero of 4 samples from the lower mainstem Scott River from Boulder Creek to the mouth, and zero of 12 samples from Mill Creek exceed the MUN objective, however these sample sizes are insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1.

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) Zero of 24 samples from Shackleford creek outside the QVIR boundary exceed the MUN water quality objective. These sample sizes do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

CONSIDERATION OF THE DATA FROM WITHIN THE QVIR BOUNDARY:
Data for this pollutant are being evaluated utilizing the guidance under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status.

Zero of 16 samples from Shackleford Creek within the QVIR boundary exceed the MUN objective. Zero of 11 samples from Snicktaw Creek within the QVIR boundary exceed the MUN objective, however this sample size is insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against USEPA 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) Zero of 16 samples from Shackleford Creek within the QVIR boundary exceed the MUN objective and this sample size does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the portions of this water body that are outside the Quartz Valley Indian Reservation boundary should not be placed on the section 303(d) list for Nitrate/Nitrite (Nitrate + Nitrite as N) because applicable water quality standards are not being exceeded.
 
State Board Staff Review of Regional Board Conclusion and Recommendation: CONSIDERATION OF THE DATA FROM WITHIN THE QVIR BOUNDARY:
Data for this pollutant are being evaluated utilizing the guidance under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status.

Zero of 16 samples from Shackleford Creek within the QVIR boundary exceed the MUN objective. Zero of 11 samples from Snicktaw Creek within the QVIR boundary exceed the MUN objective, however this sample size is insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against USEPA 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) Zero of 16 samples from Shackleford Creek within the QVIR boundary exceed the MUN objective and this sample size does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
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 32000, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46491
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 12 samples exceeded the objective for nitrate + nitrite (sum as nitrogen).
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate + nitrite (sum as nitrogen) is 10.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample data were collected from the Scott River @ USGS Gage on non-Tribal Land.
Temporal Representation: Grab sample data were collected between May 13 and October 14, 2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation QAPP for Water Quality Sampling and Analysis submitted with data. However, data spreadsheets were submitted without units for the nutrient data. It was presumed they were reported in mg/L.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32000, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46490
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 12 samples exceeded the objective for nitrate + nitrite (sum as nitrogen).
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate + nitrite (sum as nitrogen) is 10.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample data were collected from Mill Creek (tributary to Shackleford Creek) on non-Tribal Land at site MICR.
Temporal Representation: Grab sample data were collected between May 13 and October 14, 2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation QAPP for Water Quality Sampling and Analysis submitted with data. However, data spreadsheets were submitted without units for the nutrient data. It was presumed they were reported in mg/L.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32000, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43050
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate+nitrite (sum as nitrogen) is 10.0 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 32000, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46492
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 24
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 24 samples exceeded the objective for nitrate + nitrite (sum as nitrogen).
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate + nitrite (sum as nitrogen) is 10.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample data were collected from two sites in Shackeford Creek on non-Tribal Land: 1) Shackleford Creek near Trail Head (SHTH) and 2) Shackleford Creek @ Falls (SHFL).
Temporal Representation: Grab sample data were collected between May 13 and October 14, 2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation QAPP for Water Quality Sampling and Analysis submitted with data. However, data spreadsheets were submitted without units for the nutrient data. It was presumed they were reported in mg/L.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32000, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46493
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 16
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 16 samples exceeded the objective for nitrate + nitrite (sum as nitrogen).
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate + nitrite (sum as nitrogen) is 10.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample data were collected from two sites in Shackeford Creek on Tribal Land: 1) Shackleford Creek near the mouth (CHTH) and 2) Shackleford Creek @ QVIR (SRES).
Temporal Representation: Grab sample data were collected between May 13 and October 14, 2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation QAPP for Water Quality Sampling and Analysis submitted with data. However, data spreadsheets were submitted without units for the nutrient data. It was presumed they were reported in mg/L.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32000, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46494
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 11
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 11 samples exceeded the objective for nitrate + nitrite (sum as nitrogen).
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for nitrate + nitrite (sum as nitrogen) is 10.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample data were collected from Snicktaw Creek @ Reservation (SNCR) on Tribal Land.
Temporal Representation: Grab sample data were collected between May 13 and October 14, 2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation QAPP for Water Quality Sampling and Analysis submitted with data. However, data spreadsheets were submitted without units for the nutrient data. It was presumed they were reported in mg/L.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
 
DECISION ID
32025
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: 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: Two lines of evidence are available in the administrative record to assess this pollutant in the mainstem Scott River where the State of California has the legal authority to regulate water quality: one in the lower mainstem Scott River from Boulder Creek to the mouth (LOE 43112) and one in the middle mainstem Scott River from Youngs Dam to Boulder Creek (LOE 46496)

One line of evidence is available in the administrative record to assess this pollutant in Shackleford Creek on the Quartz Valley Indian Reservation (QVIR), over which the USEPA has the authority to regulate water quality (LOE 46495). The LOE for Shackleford Creek containing data from the portion of the creek that lies within the QVIR boundary is not utilized in this decision, as the State of California does not have the authority to list water bodies within the QVIR boundary. However, the data are discussed for the benefit of the USEPA, which has the jurisdiction to list water bodies on tribal land.

CONSIDERING LISTING WATER BODIES OUTSIDE THE QVIR BOUNDARY:
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.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing the lower mainstem Scott River from Boulder Creek to the mouth and the middle mainstem Scott River from Youngs Dam to Boulder Creek on the section 303(d) list in the Water Quality Limited Segments category for nitrite (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) Zero of 4 samples from the lower mainstem Scott River from Boulder Creek to the mouth, and zero of 1 sample from the middle mainstem Scott River from Youngs Dam to Boulder Creek exceed the MUN objective, however these sample sizes are insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 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.

CONSIDERATION OF THE DATA FROM WITHIN THE QVIR BOUNDARY:
Data for this pollutant are being evaluated utilizing the guidance under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against USEPA 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) Zero of 1 sample from Shackleford Creek within the QVIR boundary exceeds the MUN objective, however this sample size is insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 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: After review of the available data and information, RWQCB staff concludes that the portions of this water body that are outside the Quartz Valley Indian Reservation boundary should not be placed on the section 303(d) list for Nitrite because it cannot be determined if applicable water quality standards are not being exceeded.
 
State Board Staff 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 32025, Nitrite
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 43112
 
Pollutant: Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Nitrite as N.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 32025, Nitrite
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46495
 
Pollutant: Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of 1 samples exceeded the objective for nitrite.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample was collected from Shackleford Creek near the mouth (CHTH) on Tribal Land.
Temporal Representation: Grab sample was collected on April 29, 2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation QAPP for Water Quality Sampling and Analysis submitted with data. However, data spreadsheets were submitted without units for the nutrient data. It was presumed they were reported in mg/L.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32025, Nitrite
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46496
 
Pollutant: Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of 1 samples exceeded the objective for nitrite.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample was collected from the Scott River @ USGS gage (SRGA) on non-Tribal Land.
Temporal Representation: Grab sample was collected on April 29, 2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation QAPP for Water Quality Sampling and Analysis submitted with data. However, data spreadsheets were submitted without units for the nutrient data. It was presumed they were reported in mg/L.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
 
DECISION ID
29971
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Nitrogen, ammonia (Total 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)(2010)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Ten lines of evidence are available in the administrative record to assess this pollutant in water bodies where the State of California has the legal authority to regulate water quality: two for Shackleford Creek outside the Quartz Valley Indian Reservation (QVIR) boundary (LOEs 33962 and 33964), seven for the mainstem Scott River (LOEs 26298, 33984, 34535, 47565, 47566, 47567, and 47568), and one for Mill Creek (34001).

Two lines of evidence are available in the administrative record to assess this pollutant in water bodies on the QVIR, over which the USEPA has the authority to regulate water quality: one for Shackleford Creek on QVIR land (LOE 33982) and one for Snicktaw Creek on QVIR land (LOE 33983).

The LOEs containing data from the portion of water bodies that lie within the QVIR boundary are not utilized in this decision, as the State of California does not have the authority to list water bodies within the QVIR boundary. However, the data is discussed for the benefit of the USEPA, which has the jurisdiction to list water bodies on tribal land.

It should be noted that data from LOE 26298 from the 2010 Integrated Report were re-assessed this current Integrated Report cycle in LOEs 47565, 47566, 47567, and 47568. Additionally, the pollutant name has been changed from “Ammonia as Nitrogen” to “Nitrogen, ammonia (Total Ammonia)”.

CONSIDERING LISTING WATER BODIES OUTSIDE THE QVIR BOUNDARY:
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 (LOE 47565) is available to assess protection of the cold freshwater habitat (COLD) beneficial use and one line of evidence (LOE 34535) is available to assess protection of the spawning, incublation, and/or early development (SPWN) beneficial use in the lower mainstem Scott River near the Klamath River. Two lines of evidence (LOEs 47567 and 47568) are available to assess protection of the COLD beneficial use and one line of evidence (LOE 33984) is available to assess protection of the SPWN beneficial use in the middle mainstem Scott River. One line of evidence (LOE 47566) is available to assess protection of the COLD beneficial use in the upper mainstem Scott River at Callahan. One line of evidence (LOE 34001) is available to assess the protection of the SPWN beneficial use in Mill Creek and two lines of evidence (LOEs 33962 and 33964) are available to assess protection of the SPWN beneficial use in Shackleford Creek outside the QVIR boundary.

Zero of 22 samples from Shackleford Creek outside the QVIR boundary exceed the SPWN water quality criteria and zero of 22 samples from the lower mainstem Scott River at Klamath exceed the COLD criteria.

The following samples sizes are insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 2 exceedances of the objective with less than 16 samples is needed for application of Table 3.1: (1) zero of 10 samples from the middle mainstem Scott River and zero of 9 samples from the upper mainstem Scott River at Callahan exceed the COLD criteria; (2) Zero of 4 samples from the lower mainstem Scott River at Klamath, zero of 10 samples from the middle mainstem Scott River, and zero of 10 samples from Mill Creek exceed the SPWN criteria.

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) Zero of 22 samples from Shackleford Creek outside the QVIR boundary exceed the SPWN water quality criteria and zero of 22 samples from the lower mainstem Scott River at Klamath exceed the COLD criteria. These sample sizes do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the portions of this water body that are outside the Quartz Valley Indian Reservaion boundary should not be placed on the section 303(d) list for Nitrogen, ammonia (Total Ammonia) because applicable water quality standards are not being exceeded.

CONSIDERATION OF THE DATA FROM WITHIN THE QVIR BOUNDARY:
Data for this pollutant are being evaluated utilizing the guidance under Section 3.1 of the Listing Policy. Under Section 3.1, a single line of evidence is necessary to assess listing status.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against USEPA 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) Zero of 10 samples from Shackleford Creek within the QVIR boundary and zero of 3 samples from Snicktaw Creek within the QVIR boundary exceed the SPWN criteria, and these sample sizes are insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 16 samples, or (b) greater than or equal to 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.
 
State Board Staff Review of Regional Board Conclusion and Recommendation: 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) Zero of 22 samples from Shackleford Creek outside the QVIR boundary exceed the SPWN water quality criteria and zero of 22 samples from the lower mainstem Scott River at Klamath exceed the COLD criteria. These sample sizes do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
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 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47567
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 3 ammonia as nitrogen samples collected from the Scott River at Fort Jones 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). This LOE and LOEs 47565, 47566, and 47568 replace LOE 26298 from the 2010 Integrated Report. The original LOE was replaced in order to re-assess data from each site in its own LOE and to change the pollutant name from "Ammonia as Nitrogen" to "Nitrogen, Ammonia (Total Ammonia)".
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: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected from the mainstem Scott River at Fort Jones (SWAMP Station ID 105SCOTFJ). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Fort Jones sites, samples were collected from February 2002 to April 2002. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47568
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 7 ammonia as nitrogen samples collected from the Scott River at Jones Beach 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). This LOE and LOEs 47565, 47566, and 47567 replace LOE 26298 from the 2010 Integrated Report. The original LOE was replaced in order to re-assess data from each site in its own LOE and to change the pollutant name from "Ammonia as Nitrogen" to "Nitrogen, Ammonia (Total Ammonia)".
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: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected from the mainstem Scott River at Jones Beach (SWAMP Station ID 105SCOTJB). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Jones Beach site, samples were collected from May 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47566
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 9 ammonia as nitrogen samples collected from the Scott River at Callahan 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). This LOE and LOEs 47565, 47567, and 47568 replace LOE 26298 from the 2010 Integrated Report. The original LOE was replaced in order to re-assess data from each site in its own LOE and to change the pollutant name from "Ammonia as Nitrogen" to "Nitrogen, Ammonia (Total Ammonia)".
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: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected from the mainstem Scott River at Callahan (SWAMP Station ID 105SCOTCA). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47565
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 22
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 22 ammonia as nitrogen samples collected from the Scott River near the Klamath 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). This LOE and LOEs 47566, 47567, and 47568 replace LOE 26298 from the 2010 Integrated Report. The original LOE was replaced in order to re-assess data from each site in its own LOE and to change the pollutant name from "Ammonia as Nitrogen" to "Nitrogen, Ammonia (Total Ammonia)".
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: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected from the mainstem Scott River near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34535
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. 1 of the 4 data are reported as non-detect limits. These non-detect limits are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Sample was collected at 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected between 11/15/2007 and 2/27/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 26298
 
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: 40
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 40 ammonia as nitrogen samples collected from the Scott 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: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
 
Spatial Representation: Samples were collected from the mainstem Scott River from 4 locations as follows: (1) at Callahan (SWAMP Station ID 105SCOTCA), (2) at Fort Jones (SWAMP Station ID 105SCOTFJ), (3) at Jones Beach (SWAMP Station ID 105SCOTJB), and (4) near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. At the Fort Jones sites, samples were collected from February 2002 to April 2002. At the Jones Beach sites, samples were collected from May 2002 to June 2003. At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33962
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. The data are reported as <0.010 mg/L, which is the quantitation limit. This quantitation limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Sample was collected at Shackleford @ Trailhead.
Temporal Representation: Samples were collected from 8/6/2008 to 10/29/2008 and from 9/2/2009 to 9/30/2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation submitted a signed QAPP.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33964
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. The data are reported as <0.010 mg/L, which is the quantitation limit. This quantitation limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Sample was collected at Shackleford @ Falls.
Temporal Representation: Samples were collected from 8/6/2008 to 10/29/2008 and from 9/2/2009 to 9/30/2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation submitted a signed QAPP.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34001
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. The data are reported as <0.010 mg/L, which is the quantitation limit. This quantitation limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Sample was collected at Mill Creek (tributary to Shackleford Creek).
Temporal Representation: Samples were collected from 8/6/2008 to 10/29/2008 and from 9/2/2009 to 9/30/2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation submitted a signed QAPP.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33983
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. The data are reported as <0.010 mg/L, which is the quantitation limit. This quantitation limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Sample was collected at Sniktaw Creek@Rez.
Temporal Representation: Samples were collected from 9/2/2009 to 9/30/2009.
Environmental Conditions:
QAPP Information: The Quartz Valley Indian Reservation submitted signed QAPP.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33982
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. 9 of the 10 data are reported as <0.010 mg/L, which is the quantitation limit. This quantitation limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Sample was collected at Shackleford near mouth -Lower Shackleford.
Temporal Representation: Samples were collected from 8/6/2008 to 10/29/2008 and from 9/2/2009 to 9/30/2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation submitted a signed QAPP.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 29971, Nitrogen, ammonia (Total Ammonia)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33984
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the samples exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. 8 of the 10 data are reported as <0.010 mg/L, which is the quantitation limit. This quantitation limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Update of Ambient Water Quality Criteria for Ammonia (USEPA 1999): Where salmonids and fish early life stages are present, the 30-day average concentration (criterion continuous concentration or CCC) of total ammonia (as mg N/L) in freshwater are not to be exceeded more than once every three years on average. The CCC values are based on pH, temperature, and the presence of early life stages of fish. The CCC formula is found on p.83 and the table of CCC values are found on p.87.
Guideline Reference: 1999 Update of Ambient Water Quality Criteria for Ammonia
 
Spatial Representation: Sample was collected at Scott River @ USGS Gage.
Temporal Representation: Samples were collected from 8/6/2008 to 10/29/2008 and from 9/2/2009 to 9/30/2009.
Environmental Conditions:
QAPP Information: Quartz Valley Indian Reservation submitted a signed QAPP.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
 
DECISION ID
24922
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: PCBs (Polychlorinated biphenyls)
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status Revised
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. Two lines of evidence (LOEs 47560 and 33279) are available to assess protection of the municipal and domestic supply (MUN) beneficial use and one line of evidence (LOE 33280) is available to assess protection of the cold freshwater habitat (COLD) beneficial use in the lower mainstem Scott River near the Klamath River. One line of evidence (LOE 47559) is available to assess protection of the municipal and domestic supply (MUN) beneficial use in the middle mainstem Scott River at Jones Beach. One line of evidence (LOE 47558) is available to assess protection of the municipal and domestic supply (MUN) beneficial use in the upper mainstem Scott River at Callahan.

It should be noted that data from one additional LOE from the 2010 Integrated Report cycle (LOE 25459) have been re-assessed in LOEs 47558, 47559, and 47560. Data from these three LOEs were all non-detect or detect not quantified and the method detection limit for all of the samples was greater than the criteria: thus, per the Listing Policy, the data were not used in this assessment.

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) Zero of two water samples from the lower mainstem Scott River near the Klamath River exceed the COLD water quality objective, however 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 to 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: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Staff 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 24922, PCBs (Polychlorinated biphenyls)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47560
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The data were all non-detect or detect not quantafied and the method detection limit for all 15 of the samples was greater than the criteria: thus, per the Listing Policy, the data were not used in this assessment. This LOE and LOEs 47558 and 47559 re-assess data from LOE 25459 from the 2010 Integrated Report cycle. The LOE was reassessed in order to evaluate data for each site in its own LOE, to evaluate data against the updated objective (the California Toxics Rule total PCBs numeric objective), and to evaluate the sum of all congener or isomer or homolog or aroclor analyses from a single grab sample as one sample as the CTR specifies (instead of counting each individually).
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion for the protection of human health from the consumption of water and organisms is 0.00017 ug/L. This value corresponds to total PCBs, eg., the sum of all congener or isomer or homolog or aroclor analyses (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24922, PCBs (Polychlorinated biphenyls)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47558
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The data were all non-detect and the method detection limit for all 4 of the samples was greater than the criteria: thus, per the Listing Policy, the data were not used in this assessment. This LOE and LOEs 47559 and 47560 re-assess data from LOE 25459 from the 2010 Integrated Report cycle. The LOE was reassessed in order to evaluate data for each site in its own LOE, to evaluate data against the updated objective (the California Toxics Rule total PCBs numeric objective), and to evaluate the sum of all congener or isomer or homolog or aroclor analyses from a single grab sample as one sample as the CTR specifies (instead of counting each individually).
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion for the protection of human health from the consumption of water and organisms is 0.00017 ug/L. This value corresponds to total PCBs, eg., the sum of all congener or isomer or homolog or aroclor analyses (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River at Callahan (SWAMP Station ID 105SCOTCA). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected on 4 days from February 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24922, PCBs (Polychlorinated biphenyls)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33280
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 2
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 2 samples exceeded the criterion continuous concentration for total PCB. The water body was assessed for the 3 aroclors that were contained within the data set and they include aroclor 1248, aroclor 1254, and aroclor 1260.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.014 ug/L. This value corresponds to the sum of aroclors 1242, 1254, 1221, 1232, 1248, 1260, and 1016 (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples collected on 4/9/2008 and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 24922, PCBs (Polychlorinated biphenyls)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33279
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The method detection limit for all 3 of the non-detect samples was greater than the criteria: thus the data was not used in this assessment.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion for the protection of human health from the consumption of water and organisms is 0.00017 ug/L. This value corresponds to total PCBs, eg., the sum of all congener or isomer or homolog or aroclor analyses (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples were collected on 11/15/2007, 4/9/2008, and 7/16/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 24922, PCBs (Polychlorinated biphenyls)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47559
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The data were all non-detect and the method detection limit for all 4 of the samples was greater than the criteria: thus, per the Listing Policy, the data were not used in this assessment. This LOE and LOEs 47558 and 47560 re-assess data from LOE 25459 from the 2010 Integrated Report cycle. The LOE was reassessed in order to evaluate data for each site in its own LOE, to evaluate data against the updated objective (the California Toxics Rule total PCBs numeric objective), and to evaluate the sum of all congener or isomer or homolog or aroclor analyses from a single grab sample as one sample as the CTR specifies (instead of counting each individually).
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The total PCB criterion for the protection of human health from the consumption of water and organisms is 0.00017 ug/L. This value corresponds to total PCBs, eg., the sum of all congener or isomer or homolog or aroclor analyses (California Toxics Rule, 2000).
Objective/Criterion Reference: Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River at Jones Beach (SWAMP Station ID 105SCOTJB). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Jones Beach sites, samples were collected from May 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24922, PCBs (Polychlorinated biphenyls)
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 25459
 
Pollutant: PCBs (Polychlorinated biphenyls)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1200
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 1,200 polychlorinated biphenyl (PCB) analytes collected in the Scott River exceed the evaluation guideline. Each of the 24 samples were analyzed for 50 PCB cogeners. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the 5-Year Monitoring Report (NCRWQCB 2008).
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007, p. 3-4.00): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: Per the "Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Found in Drinking Water" (OEHHA 2007): The health-protective concentration of water-soluble PCBs in
drinking water associated with a one in one million extra lifetime cancer risk is 0.09 ug/L.
Guideline Reference: Public Health Goal for Water Soluble Polychlorinated Biphenyls Expected to Be Found in Drinking Water. Pesticide and Environmental Toxicology Branch, Office of Environmental Health Hazard Assessment, California Environmental Protection Agency
 
Spatial Representation: Samples were collected from the mainstem Scott River from 4 locations as follows: (1) at Callahan (SWAMP Station ID 105SCOTCA), (2) at Fort Jones (SWAMP Station ID 105SCOTFJ), (3) at Jones Beach (SWAMP Station ID 105SCOTJB), and (4) near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. At the Fort Jones sites, samples were collected from February 2002 to April 2002. At the Jones Beach sites, samples were collected from May 2002 to June 2003. At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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
22652
Region 1     
Klamath River HU, Scott River HA
 
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)(2010)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the Section 303(d) list under Section 3.2 of the Listing Policy. Under Section 3.2 a single line of evidence is necessary to assess listing status. Two lines of evidence (LOEs 34421 and 47569) are available to assess protection of the municipal and domestic supply (MUN) beneficial use in the lower mainstem Scott River near the Klamath River. Two lines of evidence (LOEs 47570 and 47571) are available to assess protection of the municipal and domestic supply (MUN) beneficial use in the middle mainstem Scott River at Jones Beach and Fort Jones. One line of evidence (LOE 47572) is available to assess protection of the municipal and domestic supply (MUN) beneficial use in the upper mainstem Scott River at Callahan.

It should be noted that data from LOE 21224 from the 2010 Integrated Report were re-assessed this current Integrated Report cycle in LOEs 47569, 47570, 47571, and 47572.

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) One of 25 samples from the lower mainstem Scott River near the Klamath River, zero of 9 samples from the middle mainstem Scott River and zero of 9 samples from the upper mainstem Scott River at Callahan exceed the objective, however these sample sizes are insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 26 samples, or (B) greater than or equal 5 exceedances of the objective with less than 26 samples is needed for application of 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 because applicable water quality standards are not being exceeded.
 
State Board Staff 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 22652, Specific Conductivity
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47572
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 9 specific conductivity samples collected from the Scott River at Callahan 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). This LOE and LOEs 47569, 47570, and 47571 replace LOE 21224 from the 2010 Integrated Report cycle. The original LOE was replaced in order to assess data for each site in its own LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Scott River is a 90% upper limit of 350 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 250 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River at Callahan (SWAMP Station ID SCOTCA). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 22652, Specific Conductivity
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47571
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 7 specific conductivity samples collected from the Scott River at Jones Beach 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). This LOE and LOEs 47569, 47570, and 47572 replace LOE 21224 from the 2010 Integrated Report cycle. The original LOE was replaced in order to assess data for each site in its own LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Scott River is a 90% upper limit of 350 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 250 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River at Jones Beach (SWAMP Station ID SCOTJB). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the Jones Beach site, samples were collected from May 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 22652, Specific Conductivity
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47570
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 2
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 2 specific conductivity samples collected from the Scott River at Fort Jones 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). This LOE and LOEs 47569, 47571, and 47572 replace LOE 21224 from the 2010 Integrated Report cycle. The original LOE was replaced in order to assess data for each site in its own LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Scott River is a 90% upper limit of 350 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 250 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem at Fort Jones (SWAMP Station ID SCOTFJ). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the Fort Jones site, samples were collected from February 2002 to April 2002. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 22652, Specific Conductivity
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47569
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 23
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 23 specific conductivity samples collected from the Scott River near the Klamath 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). This LOE and LOEs 47570, 47571, and 47572 replace LOE 21224 from the 2010 Integrated Report cycle. The original LOE was replaced in order to assess data for each site in its own LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Scott River is a 90% upper limit of 350 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 250 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River near the Klamath River (SWAMP Station ID SCOTSH). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 22652, Specific Conductivity
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34421
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 2
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of the 2 samples exceeded the objective.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The site specific objective for the mainstem Scott River is a 90% upper limit of 350 uS. Therefore, 90% of the values in a calendar year must be lower than this limit. In addition the site specific objective of 50% upper limit of 250 uS which represents the 50 percentile values of the monthly means for a calendar year applies to this water body. Therefore, 50% or more of the monthly means in a calendar year must be less than or equal to an upper limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the Scott River near Klamath River station (105SCOTSH).
Temporal Representation: Samples were collected on the following dates: 11/15/2007 2/27/2008 4/9/2008 7/16/2008
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008).
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 22652, Specific Conductivity
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 21224
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 41
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 41 specific conductivity samples collected from the Scott 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): The 90% upper limit specific conductance objective at 77 F is 350 micromhos (or mS/cm2). The 50% upper limit specific conductance objective at 77 F is 250 micromhos (or mS/cm2). The 90% and 50% upper limits represent the 90/50 percentile values for a calendar year. 90% or 50% or more of the values must be less than or equal to the upper limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the mainstem Scott River from 4 locations as follows: (1) at Callahan (SWAMP Station ID SCOTCA), (2) at Fort Jones (SWAMP Station ID SCOTFJ), (3) at Jones Beach (SWAMP Station ID SCOTJB), and (4) near the Klamath River (SWAMP Station ID SCOTSH). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. At the Fort Jones sites, samples were collected from February 2002 to April 2002. At the Jones Beach sites, samples were collected from May 2002 to June 2003. At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
 
DECISION ID
24837
Region 1     
Klamath River HU, Scott River HA
 
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)(2010)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the Section 303(d) list under Section 3.2 of the Listing Policy. Under Section 3.2 a single line of evidence is necessary to assess listing status. Two lines of evidence (LOEs 34237 and 47561) are available to assess this pollutant in the lower mainstem Scott River near the Klamath River. Two lines of evidence (LOEs 47562 and 47563) are available to assess this pollutant in the middle mainstem Scott River at Jones Beach and at Fort Jones. One line of evidence (LOE 47564) is available to assess this pollutant in the upper mainstem Scott River at Callahan.

It should be noted that data from one additional LOE from the 2010 Integrated Report cycle (LOE 25523) have been re-assessed in LOEs 47561, 47562, 47563, and 47564.

Zero of 26 samples from the lower mainstem Scott River near the Klamath River exceed the evaluation guideline. Zero of 10 samples from the middle Scott River (Fort Jones and Jones Beach) and zero of 9 samples from the upper mainstem Scott River at Callahan exceed the evaluation guideline, however these sample sizes are insufficient to determine with the power and confidence of the Listing Policy if standards are not met, as a minimum of either (A) 26 samples, or (B) greater than or equal 5 exceedances of the objective with less than 26 samples is needed for application of Table 3.2.

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) Zero of 26 samples from the lower mainstem Scott River near the Klamath River exceed the evaluation guideline, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Staff 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 24837, Sulfates
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47561
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 22
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 22 sulfate samples collected in the lower Scott River near the Klamath 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). This LOE and LOEs 47562, 47563, and 47564 replace LOE 25523 from the 2010 Integrated Report cycle. The original LOE has been replaced in order to evaluate data for each site in its own, individual LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): 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) for the North Coast Region
 
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 mainstem Scott River near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24837, Sulfates
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47562
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 7 sulfate samples collected in the middle Scott River at Jones Beach 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). This LOE and LOEs 47561, 47563, and 47564 replace LOE 25523 from the 2010 Integrated Report cycle. The original LOE has been replaced in order to evaluate data for each site in its own, individual LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): 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) for the North Coast Region
 
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 mainstem Scott River at Jones Beach (SWAMP Station ID 105SCOTJB). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Jones Beach sites, samples were collected from May 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24837, Sulfates
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47563
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 3 sulfate samples collected in the middle Scott River at Fort Jones 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). This LOE and LOEs 47561, 47562, and 47564 replace LOE 25523 from the 2010 Integrated Report cycle. The original LOE has been replaced in order to evaluate data for each site in its own, individual LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): 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) for the North Coast Region
 
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 mainstem Scott River at Fort Jones (SWAMP Station ID 105SCOTFJ). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Fort Jones sites, samples were collected from February 2002 to April 2002. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24837, Sulfates
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47564
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 9 sulfate samples collected in the upper Scott River at Callahan 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). This LOE and LOEs 47561, 47562, and 47563 replace LOE 25523 from the 2010 Integrated Report cycle. The original LOE has been replaced in order to evaluate data for each site in its own, individual LOE.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): 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) for the North Coast Region
 
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 mainstem Scott River at Callahan (SWAMP Station ID 105SCOTCA). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24837, Sulfates
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 25523
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 41
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 41 sulfate samples collected in the Scott 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 mainstem Scott River from 4 locations as follows: (1) at Callahan (SWAMP Station ID 105SCOTCA), (2) at Fort Jones (SWAMP Station ID 105SCOTFJ), (3) at Jones Beach (SWAMP Station ID 105SCOTJB), and (4) near the Klamath River (SWAMP Station ID 105SCOTSH). Samples were collected as grab samples from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. At the Fort Jones sites, samples were collected from February 2002 to April 2002. At the Jones Beach sites, samples were collected from May 2002 to June 2003. At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (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 24837, Sulfates
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34237
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the evaluation guideline.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
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 Scott River near Klamath River station (105SCOTSH).
Temporal Representation: Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
 
DECISION ID
32295
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Total Dissolved Solids
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 section 303(d) list under section 3.2 of the Listing Policy. Under this section of the policy, a minimum of one line of evidence is needed to assess listing status. One line of evidence is available in the administrative record to assess this pollutant in the lower mainstem Scott River from Boulder Creek to the mouth.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing the lower mainstem Scott River from Boulder Creek to the mouth on the section 303(d) list in the Water Quality Limited Segments category for total dissolved solids (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) Zero of four samples from the lower mainstem Scott River from Boulder Creek to the mouth exceeds the 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) 26 samples, or (B) greater than or equal to 5 exceedances of the MUN objective with less than 26 samples is needed for application of 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 because it cannot be determined if applicable water quality standards are not being exceeded.
 
State Board Staff 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 32295, Total Dissolved Solids
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34278
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the recommended level of 500 mg/L.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2011): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. For Total Dissolved Solids (TDS), the secondary MCL recommended range is 500 mg/l, the upper range is 1000 mg/l, and the short term range is 1500 mg/l. The recommended range of 500 mg/L was used for the purpose of this assessment.
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at station 105SCOTSH (Scott River near Klamath River).
Temporal Representation: Samples were collected on 11/15/2007, 4/9/2008, 7/16/2008, and 2/27/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
 
DECISION ID
24531
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Aluminum
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2010)
Revision Status Revised
Sources: Source Unknown
Expected TMDL Completion Date: 2025
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. Two lines of evidence (LOEs 47439 and 47337) are available in the administrative record to assess this pollutant in the lower mainstem Scott River near the Klamath River. Two lines of evidence (LOEs 47551 and 47552) are available to assess this pollutant in the middle mainstem Scott River at Jones Beach and at Fort Jones. One line of evidence (LOE 47553) is available to assess this pollutant in the upper mainstem Scott River at Callahan.

It should be noted that data from LOE 25361 from the 2010 Integrated Report were re-assessed this current Integrated Report cycle in LOEs 47439, 47551, 47552, and 47553.

One of 21 samples from the lower mainstem Scott River near the Klamath River exceeds the objective and two of nine samples from the middle mainstem Scott River (Jones Beach and Fort Jones) exceed the objective. Zero of 8 samples from the upper mainstem Scott River at Callahan exceed the objective, however 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.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing the middle mainstem Scott River (from Young's Dam to Boulder Creek) on the section 303(d) list for aluminum in the Water Quality Limited Segments category (i.e., sufficient justification to list). This conclusion is based on the staff findings that: (1) The data used satisfies the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfies the data quantity requirements of Section 6.1.5 of the Policy. (3) Two of 9 samples from the middle mainstem Scott River (from Young's Dam to Boulder Creek) exceed the objective and this sample size exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. (4) Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the middle mainstem Scott River from Young's Dam to Boulder Creek should be placed on the section 303(d) list for aluminum because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
 
State Board Staff 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 24531, Aluminum
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47439
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 17
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of the 17 aluminum samples collected from the mainstem Scott River near the Klamath 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). This LOE and LOEs 47551, 47552, and 47553 replace LOE 25361 from the 2010 Integrated Report cycle. The LOE was revised to evaluate data from each site in its own LOE and to reflect that the secondary MCL, and not the primary MCL, is being used to compare data to.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 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 mainstem Scott River near the Klamath River (SWAMP Station ID SCOTSH). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the site near the Klamath River, samples were collected from March 2001 to June 2006. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 24531, Aluminum
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 41337
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP data for Klamath River HU, Scott River HA to determine beneficial use support and results are as follows: 1 of 4 samples exceed the criterion for Aluminum.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Scott River HA was collected at 1 monitoring site [ Scott River near Klamath River - 105SCOTSH]
Temporal Representation: Data was collected over the time period 11/15/2007-7/16/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 24531, Aluminum
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47553
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Zero of the 8 aluminum samples collected from the mainstem Scott River at Callahan 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). This LOE and LOEs 47439, 47551, and 47552 replace LOE 25361 from the 2010 Integrated Report cycle. The LOE was revised to evaluate data from each site in its own LOE and to reflect that the secondary MCL, and not the primary MCL, is being used to compare data to.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 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 mainstem Scott River at Callahan (SWAMP Station ID SCOTCA). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the Callahan site, samples were collected from February 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 24531, Aluminum
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47552
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 6
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of the 6 aluminum samples collected from the mainstem Scott River at Jones Beach 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). This LOE and LOEs 47439, 47551, and 47553 replace LOE 25361 from the 2010 Integrated Report cycle. The LOE was revised to evaluate data from each site in its own LOE and to reflect that the secondary MCL, and not the primary MCL, is being used to compare data to.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 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 mainstem Scott River at Jones Beach (SWAMP Station ID SCOTJB). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the Jones Beach sites, samples were collected from May 2002 to June 2003. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 24531, Aluminum
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 47551
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of the 3 aluminum samples collected from the mainstem Scott River at Fort Jones exceeds 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). This LOE and LOEs 47439, 47552, and 47553 replace LOE 25361 from the 2010 Integrated Report cycle. The LOE was revised to evaluate data from each site in its own LOE and to reflect that the secondary MCL, and not the primary MCL, is being used to compare data to.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 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 mainstem Scott River at Fort Jones (SWAMP Station ID SCOTFJ). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation: At the Fort Jones sites, samples were collected from February 2002 to April 2002. Most of the site visits corresponded to fall, winter, spring and early summer seasonal conditions.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
 
DECISION ID
31908
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Biostimulatory Conditions
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Sources: Source Unknown
Expected TMDL Completion Date: 2025
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: The middle mainstem Scott River from Young's Dam to Boulder Creek is being considered for placement on the section 303(d) list under section 3.11 of the Listing Policy for Biostimulatory Conditions. Under this section when all other listing factors do not result in the listing of a water segment but information indicates non-attainment of standards, a water segment shall be evaluated to determine whether the weight of evidence demonstrates that water quality standard is not attained. If the weight of evidence indicates non-attainment, the water segment shall be placed on the section 303(d) list.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing the middle mainstem Scott River from Young's Dam to Boulder Creek on the section 303(d) list for Biostimulatory Conditions (i.e., sufficient justification to 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) 170 of 726 daily minimum dissolved oxygen measurements exceed the Basin Plan DO objective. Additionally, the extremely high DO values, coupled with the large diel swing of the DO data, suggest that the water body is exhibiting biostimulatory conditions.
(3) 224 of 781 daily maximum pH values are above the 8.5 Basin Plan objective. Although none of the daily minimum pH values exceed the objective, the large diurnal swing of the data suggest that the water body is exhibiting biostimulatory conditions.
(4) Nine of 24 total nitrogen (TN) values exceeded the targets for the mainstem Scott River presented in the Klamath TMDL.
(5) Taken together the weight of evidence reflects that the middle mainstem Scott River from Young's Dam to Boulder Creek is exhibiting biostimulatory conditions.
(6) This process is scientifically defensible and reproducible.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the middle mainstem Scott River from Young's Dam to Boulder Creek should be placed on the section 303(d) list for Biostimulatory Conditions because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
 
State Board Staff 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 31908, Biostimulatory Conditions
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46765
 
Pollutant: Biostimulatory Conditions
LOE Subgroup: Adverse Biological Responses
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Except in extreme cases, nutrients alone do not impair beneficial uses. Rather, they can contribute to biostimulatory conditions within the water body by causing excessive algal growth, which in turn contributes to extreme diel patterns for dissolved oxygen (DO) and pH that impair beneficial uses. Water body specific factors such as riparian cover, flow, stream channel configuration, and water temperature affect how nutrients are processed within the stream and play a large role in determining whether or not biostimulatory conditions will prevail. For these reasons the assessment of biostimulatory conditions includes, first, an evaluation of nutrient related "primary indicator" parameters (DO, pH, and chlorophyll-a) for evidence of biostimulatory conditions that could potentially impair beneficial uses. An evaluation of Total Nitrogen (TN) and Total Phosphorus (TP) data can also be conducted, although it is not necessary to have information on these parameters to establish a biostimulatory conditions listing as factors other than nutrients can contribute to biostimulatory conditions (as outlined above). Note that the Basin Plan numeric objectives for DO and pH are utilized in this assessment, rather than the NNE DO and pH values. This is due to the fact that the Basin Plan objectives are more protective of beneficial uses and are specific to the Scott River HA (rather than the state-wide values utilized in the NNE).

Benthic Algal Biomass (mg Chl-a/m2) Data: Chlorophyll-a data submitted were water column Chlorophyll-a measurements (mg/L), which cannot be used in the determination of biostimulatory conditions.

DO Data: 170 of 726 daily minimum DO measurements exceed the Basin Plan DO objective. Additionally, the extremely high DO values at this site, coupled with the large diel swing of the DO data, suggest that the water body is exhibiting biostimulatory conditions.

pH Data: 224 of 781 daily maximum pH values are above the 8.5 Basin Plan objective. Although none of the daily minimum pH values exceed the objective, the large diurnal swing of the data suggest that the water body is exhibiting biostimulatory conditions.

TP Data: Zero of 24 TP values exceed the targets for the mainstem Scott River presented in the Klamath River TMDL.

TN Data: Nine of 24 TN values exceeded the targets for the mainstem Scott River presented in the Klamath TMDL.

Summary of Biostimulatory Conditions Impairment Assessment: Taken together the weight of evidence reflects that the middle mainstem Scott River from Youngs Dam to Boulder Creek is exhibiting biostimulatory conditions.
Data Reference: Submittal for the Integrated Report. Includes Nutrient, Chlorophyll-a, continuous dissolved oxygen, and continuous pH data for the Scott River at the Gauge.
 
SWAMP Data:
 
Water Quality Objective/Criterion: Per the Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses. DISSOLVED OXYGEN: Basin Plan Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit. PH: Basin Plan Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: California Nutrient Numeric Endpoint (NNE) Framework (Creager et al. 2006), BURC II/III thresholds for COLD benthic algal biomass = 150 mg chl-a/m2. Klamath River TMDL (NCRWQCB 2010) Scott River monthly mean nutrient concentrations (Table 5.15): (1) May - October TP = 0.028, TN = 0.310; (2) November - April TP = 0.019, TN = 0.325.
Guideline Reference: Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
  Final Staff Report for the Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrient, and Microcystin Impairments in California and the Klamath River and Lost River Implementation Plans
 
Spatial Representation: Data are from the Scott River at the USGS Gauge (site SRGA).
Temporal Representation: Water column chlorophyll-a grab samples were collected approximately monthly from June - October 2008. Continuous dissolved oxygen and data were collected June - September 2007 and January - December in 2008 and 2009. TP and TN grab samples were collected from June - October 2008 and April - October 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
 
DECISION ID
32296
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: Oxygen, Dissolved
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Sources: Source Unknown
Expected TMDL Completion Date: 2025
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: LIST MIDDLE MAINSTEM SCOTT RIVER FROM YOUNG'S DAM TO BOULDER CREEK:
The middle mainstem Scott River from Young's Dam to Boulder Creek is being considered for placement on the section 303(d) list for dissolved oxygen 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 protection of the cold freshwater habitat (COLD) beneficial use in the middle mainstem Scott River from Young's Dam to Boulder Creek (LOEs 33173, 32597, and 46766).

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing the middle mainstem Scott River from Young's Dam to Boulder Creek on the section 303(d) list for dissolved oxygen in the Water Quality Limited Segments category (i.e., sufficient justification to 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) 170 of 810 samples exceed the objective and this exceeds the allowable frequency of 135 from Section 3.2 of the Listing Policy. (4) Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

DO NOT LIST LOWER MAINSTEM SCOTT RIVER, MILL CREEK, SUGAR PINE, AND SHACKLEFORD CREEK OUTSIDE QVIR:
The Lower mainstem Scott River from Boulder Creek to the mouth, Mill Creek, Sugar Pine, and Shackleford Creek outside the Quartz Valley Indian Reservation are being considered for placement on the section 303(d) list for dissolved oxygen under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

Ten lines of evidence are available in the administrative record to assess protection of the cold freshwater habitat (COLD) beneficial use: three for the lower Scott River (LOEs 34080, 32595, and 32593) one for Mill Creek (LOE 32588), one for Sugar Pine (LOE 32628), and five for Shackleford Creek outside the QVIR (LOEs 32612, 32590, 32619, 32610, and 32592).

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing the lower Scott River from Boulder Creek to the mouth, Mill Creek, Sugar Pine, and Shackleford Creek on the section 303(d) list for dissolved oxygen 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) Two of 89 samples from Shackleford Creek outside the QVIR exceeded the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. Zero of 9 samples from the lower Scott River from Boulder Creek to the mouth, zero of 1 sample from Sugar Pine, and 1 of 19 samples from Mill Creek exceed the COLD objective, however these sample sizes are insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 26 samples, or (b) greater than or equal to 5 exceedances of the objective with less than 26 samples is needed for application of 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.

STREAMS WITHIN QVIR:
Data from Snicktaw Creek and Shackleford Creek from within the QVIR is being considered under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess protection of the cold freshwater habitat (COLD) beneficial use within the QVIR: two for Shackleford Creek (LOEs 32599 and 32614) and two for Snicktaw Creek (LOEs 32624 and 32626).

Four of 92 samples from Shackleford Creek within the QVIR boundary exceed the COLD objective, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.

Six of 26 samples from Snicktaw Creek within the QVIR boundary exceed the COLD objective and this exceeds the allowable frequency of 5 listed in Table 3.2 of the Listing Policy.

Therefore, the North Coast Regional Water Quality Control Board recommends that the USEPA list the portion Snicktaw Creek that is located on tribal land on the section 303(d) List for dissolved oxygen.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the middle mainstem Scott River from Young's Dam to Boulder Creek should be placed on the section 303(d) list for dissolved oxygen because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

After review of the available data and information, RWQCB staff concludes that Shackleford Creek outside the QVIR should not be placed on the section 303(d) list for dissolved oxygen because applicable water quality standards are not being exceeded, and the lower Scott River from Boulder Creek to the mouth, Mill Creek, and Sugar Pine should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

The North Coast Regional Water Quality Control Board recommends that the USEPA list Snicktaw Creek within the QVIR boundary on the section 303(d) List for dissolved oxygen because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
 
State Board Staff Review of Regional Board Conclusion and Recommendation: STREAMS WITHIN QVIR:
Data from Snicktaw Creek and Shackleford Creek from within the QVIR is being considered under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess protection of the cold freshwater habitat (COLD) beneficial use within the QVIR: two for Shackleford Creek (LOEs 32599 and 32614) and two for Snicktaw Creek (LOEs 32624 and 32626).

Four of 92 samples from Shackleford Creek within the QVIR boundary exceed the COLD objective, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.

Six of 26 samples from Snicktaw Creek within the QVIR boundary exceed the COLD objective and this exceeds the allowable frequency of 5 listed in Table 3.2 of the Listing Policy.

Therefore, the North Coast Regional Water Quality Control Board recommends that the USEPA list the portion Snicktaw Creek that is located on tribal land on the section 303(d) List for dissolved oxygen.
 
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 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34080
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the objective.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): The minimum dissolved oxygen objective for the mainstem Scott River is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values of the monthly means for a calendar year. 50% or more of the monthly means must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the Scott River near Klamath River station (105SCOTSH).
Temporal Representation: Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32624
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 3 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples collected at site SNCK in Sniktaw Creek.
Temporal Representation: Grab samples were collected between 6/18/2008 and 7/2/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46766
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 726
Number of Exceedances: 170
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: 170 of 726 daily minimum dissolved oxygen measurements exceeded the objective.
Data Reference: Submittal for the Integrated Report. Includes Nutrient, Chlorophyll-a, continuous dissolved oxygen, and continuous pH data for the Scott River at the Gauge.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Continuous data were collected at site SRGA (Scott River @ USGS Gage).
Temporal Representation: Continuous data were collected June - September 2007 and January - December in 2008 and 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32619
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 9 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples collected at site SUCC in Shackleford Creek (Shackleford @ Summit Outlet).
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/1/2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33173
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 62
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 62 samples were below the dissolved oxygen objective. .
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SRGA (Scott River @ USGS Gage).
Temporal Representation: Grab samples were collected between 1/16/2008 and 12/9/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32628
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The single sample did not have a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample collected at site SCSP in Sugar Pine.
Temporal Representation: Grab sample collected on 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32626
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 23
Number of Exceedances: 6
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Six of the twenty-three samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples collected at site SNCR in Sniktaw Creek (Sniktaw Creek @Rez).
Temporal Representation: Grab samples were collected between 6/4/2008 and 10/14/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32614
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 28
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 28 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected on tribal land at site SRES in Shackleford Creek (Shackleford @ QVIR).
Temporal Representation: Grab samples were collected between 5/29/2007 and 6/24/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32612
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 31
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of the 31 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples collected at site SHTH in Shackleford Creek (Shackleford @ Trailhead).
Temporal Representation: Grab samples were collected between 5/13/2007 and 10/28/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32610
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 33
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of the 33 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab collected at site SHFL in Shackleford Creek (Shackleford @ Falls).
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/28/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32599
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 64
Number of Exceedances: 4
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Four of the 64 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples collected on tribal land at site CHTH in Shackleford Creek (Shackleford near mouth, Lower Shackleford).
Temporal Representation: Grab samples were collected between 5/29/2007 and 12/9/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32597
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 22
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 22 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample collected at site SCJB (Scott River @ Jones Beach USFS public beach access).
Temporal Representation: Grab sample was collected between 7/10/2008 10/14/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32595
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The single sample did not have a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample collected in the Scott River (SCGF: Scott River @ Gold Flat).
Temporal Representation: Grab sample was collected on 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32593
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in the Scott River (SCBF: Scott River @ Bridge Flat).
Temporal Representation: Grab samples were collected between 7/24/2008 and 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32592
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 9 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in Shackleford Creek below Campbell Lake at site CAMO.
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/1/2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32590
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 7 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in Shackleford Creek above Campbell Lake at site CAMI.
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/1/2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32296, Oxygen, Dissolved
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32588
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 19
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of the 19 samples had a DO level below 7.0 mg/L.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the minimum oxygen level for surface water bodies in the Scott River HA is 7.0 mg/L. The 50% lower limit dissolved oxygen objective is 9.0 mg/L. The 50% lower limits represent the 50 percentile values for a calendar year. 50% or more of the values must be greater than or equal to the lower limit.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in Mill Creek (tributary to Shackleford Creek) at site MICR.
Temporal Representation: Grab samples were collected between 1/6/2009 and 10/28/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
 
DECISION ID
32297
Region 1     
Klamath River HU, Scott River HA
 
Pollutant: pH
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Sources: Source Unknown
Expected TMDL Completion Date: 2025
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: LIST MIDDLE MAINSTEM SCOTT RIVER AND SHACKLEFORD CREEK ABOVE CAMPBELL LAKE:
The middle mainstem Scott River from Young's Dam to Boulder Creek and Shackleford Creek above Campbell Lake are being considered for placement on the section 303(d) list for pH under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess protection of the cold freshwater habitat (COLD) beneficial use: Three for the middle mainstem Scott River from Young's Dam to Boulder Creek (LOEs 32598, 46767, and 33159) and one for Shackleford Creek above Campbell Lake (LOE 32591).

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing the middle mainstem Scott River from Young's Dam to Boulder Creek and Shackleford Creek above Campbell Lake on the section 303(d) list for pH in the Water Quality Limited Segments category (i.e., sufficient justification to 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) 233 of 868 samples from the middle mainstem Scott River from Young's Dam to Boulder Creek exceed the objective and this exceeds the allowable frequency of 144 from Section 3.2 of the Listing Policy. Eight of 8 samples from Shackleford Creek above Campbell Lake exceed the objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. (4) Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

DO NOT LIST LOWER MAINSTEM SCOTT RIVER, MILL CREEK, SUGAR PINE, AND SHACKLEFORD CREEK BELOW CAMPBELL LAKE AND ABOVE THE QVIR:
The lower mainstem Scott River from Boulder Creek to the mouth, Mill Creek, Sugar Pine, and Shackleford Creek below Campbell Lake and above the Quartz Valley Indian Reservation (QVIR) are being considered for placement on the section 303(d) list for pH under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Nine lines of evidence are available in the administrative record to assess protection of the cold freshwater habitat (COLD) beneficial use: three for lower Scott River (LOEs 32594, 32596, and 34158), one for Mill Creek (LOE 32589), one for Sugar Pine (LOE 32629), and four for Shackleford Creek below Campbell Lake and above the QVIR (LOEs 32623, 32611, 32613, and 33158).

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing the lower mainstem Scott River from Boulder Creek to the mouth, Mill Creek, Sugar Pine, and Shackleford Creek below Campbell Lake and above the QVIR on the section 303(d) list for pH 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) 12 of 85 samples from Shackleford Creek below Campbell Lake and above the QVIR exceeded the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. Zero of 9 samples from the lower mainstem Scott River from Boulder Creek to the mouth, zero of 1 sample from Sugar Pine, and 1 of 18 samples from Mill Creek exceed the COLD objective, however these sample sizes are insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 26 samples, or (b) greater than or equal to 5 exceedances of the objective with less than 26 samples is needed for application of 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.

STREAMS WITHIN QVIR:
Data from Snicktaw Creek and Shackleford Creek from within the QVIR are being considered under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess protection of the cold freshwater habitat (COLD) beneficial use within the QVIR: two for Shackleford Creek (LOEs 32615 and 32600) and two for Snicktaw Creek (LOEs 32627 and 32625).

Eleven of 95 samples from Shackleford Creek within the QVIR boundary and three of 27 samples from Snicktaw Creek exceed the objective, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. Therefore, the North Coast Regional Water Quality Control Board do not recommend that the USEPA list the portion of these water bodies that is located on tribal land on the section 303(d) List for pH.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the middle mainstem Scott River from Young's Dam to Boulder Creek and Shackleford Creek above Campbell Lake should be placed on the section 303(d) list for pH because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

After review of the available data and information, RWQCB staff concludes that Shackleford Creek below Campbell Lake and above the Quartz Valley Indian Reservation should not be placed on the section 303(d) list for pH because applicable water quality standards are not being exceeded, and the lower Scott River from Boulder Creek to the mouth, Mill Creek, and Sugar Pine should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

The North Coast Regional Water Quality Control Board do not recommend that the USEPA list Snicktaw Creek and Shackleford Creek within the QVIR boundary on the section 303(d) List for pH because applicable water quality standards are not being exceeded.
 
State Board Staff Review of Regional Board Conclusion and Recommendation: Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing the lower mainstem Scott River from Boulder Creek to the mouth, Mill Creek, Sugar Pine, and Shackleford Creek below Campbell Lake and above the QVIR on the section 303(d) list for pH 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) 12 of 85 samples from Shackleford Creek below Campbell Lake and above the QVIR exceeded the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. Zero of 9 samples from the lower mainstem Scott River from Boulder Creek to the mouth, zero of 1 sample from Sugar Pine, and 1 of 18 samples from Mill Creek exceed the COLD objective, however these sample sizes are insufficient to determine with the power and confidence of the listing policy standards are not met, as a minimum of either (a) 26 samples, or (b) greater than or equal to 5 exceedances of the objective with less than 26 samples is needed for application of 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.

STREAMS WITHIN QVIR:
Data from Snicktaw Creek and Shackleford Creek from within the QVIR are being considered under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess protection of the cold freshwater habitat (COLD) beneficial use within the QVIR: two for Shackleford Creek (LOEs 32615 and 32600) and two for Snicktaw Creek (LOEs 32627 and 32625).

Eleven of 95 samples from Shackleford Creek within the QVIR boundary and three of 27 samples from Snicktaw Creek exceed the objective, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. Therefore, the North Coast Regional Water Quality Control Board do not recommend that the USEPA list the portion of these water bodies that is located on tribal land on the section 303(d) List for pH.
 
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 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 46767
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 781
Number of Exceedances: 224
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: 224 of 781 daily maximum pH values exceeded the Basin Plan objective. None of the daily minimum pH values exceeded the objective.
Data Reference: Submittal for the Integrated Report. Includes Nutrient, Chlorophyll-a, continuous dissolved oxygen, and continuous pH data for the Scott River at the Gauge.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Continuous data were collected at site SRGA (Scott River @ USGS Gage).
Temporal Representation: Continuous data were collected June - September 2007 and January - December in 2008 and 2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32589
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 18
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of the 18 samples was below the minimum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in Mill Creek (tributary to Shackleford Creek)at site MICR.
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/1/2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32591
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 8
Number of Exceedances: 8
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: All of the 8 samples were below the minimum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in Shackleford Creek above Campbell Lake at site CAMI.
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/1/2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32594
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples were below the minimum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in the Scott River (SCBF: Scott River @ Bridge Flat).
Temporal Representation: Grab samples were collected between 7/24/2008 and 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32596
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The single sample was not below the minimum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in the Scott River (SCGF: Scott River @ Gold Flat).
Temporal Representation: Grab samples were collected between 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32598
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 65
Number of Exceedances: 3
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three of the 65 samples were above the maximum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SRGA (Scott River @ USGS Gage).
Temporal Representation: Grab samples were collected between 1/16/2008 and 12/9/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32600
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 66
Number of Exceedances: 8
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Eight of the 66 samples were below the minimum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site CHTH in Shackleford Creek (Shackleford near mouth, Lower Shackleford).
Temporal Representation: Grab samples were collected between 5/29/2007 and 12/9/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32611
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 32
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 32 samples were below the minimum or above them maximum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SHFL in Shackleford Creek (Shackleford @ Falls).
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/28/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32613
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 33
Number of Exceedances: 2
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Two of the 33 samples were below the minimum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SHTH in Shackleford Creek (Shackleford @ Trailhead).
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/28/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32615
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 29
Number of Exceedances: 3
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three of the 29 samples were below the minimum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SRES in Shackleford Creek (Shackleford @ QVIR).
Temporal Representation: Grab samples were collected between 5/29/2007 and 6/24/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32623
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 10
Number of Exceedances: 3
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three of the 10 samples were below the minimum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SUCC in Shackleford Creek.
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/1/2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32625
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 3 samples were below the minimum or above the maximum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SNCK in Sniktaw Creek.
Temporal Representation: Grab samples were collected between 6/18/2008 and 7/2/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32627
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 24
Number of Exceedances: 3
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Three of the 24 samples were below the minimum and one sample was above the maximum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SNCR in Sniktaw Creek (Sniktaw Creek @Rez).
Temporal Representation: Grab samples were collected between 6/4/2008 and 10/14/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 32629
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The single sample was not below the minimum or above the maximum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab sample collected at site SCSP in Sugar Pine.
Temporal Representation: Grab samples collected 8/19/2008.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 34158
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 4 samples exceeded the objective.
Data Reference: RWB1 Trend Maintenance Periods FYs 2007 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the lower limit pH for this water body is 7.0, and the upper limit pH for this water body is 8.5.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected from the Scott River near Klamath River station (105SCOTSH).
Temporal Representation: Samples were collected approximately once per quarter year from November 2007 to July 2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33159
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 22
Number of Exceedances: 6
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Six of the 22 samples were above the maximum water quality objective for pH.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected at site SCJB (Scott River @ Jones Beach).
Temporal Representation: Grab samples were collected between 7/10/2008 and 10/14/2009.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.
 
Line of Evidence (LOE) for Decision ID 32297, pH
Region 1     
Klamath River HU, Scott River HA
 
LOE ID: 33158
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 10
Number of Exceedances: 7
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Seven of the 9 samples had a pH below 7.0.
Data Reference: Data for nutrients and bacteria for Scott River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Table 3-1 states that the water quality objective for pH for water bodies in the Scott River HA is a maximum of 8.5 and minimum of 7.0.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Grab samples were collected in Shackleford Creek below Campbell Lake at site CAMO.
Temporal Representation: Grab samples were collected between 5/29/2007 and 10/1/2007.
Environmental Conditions:
QAPP Information: Quality Assurance Project Plan for Water Quality Sampling and Analysis for the Quartz Valley Indian Reservation, Fort Jones, California (QA Office Document Number WATR0587QV2).
QAPP Information Reference(s): Quality Assurance Project Plan for Water Quality Sampling and Analysis for Quartz Valley Indian Reservation.