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

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name: Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
Water Body ID: CAR1053107519990610152950
Water Body Type: River & Stream
 
DECISION ID
71297
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Nutrients
Final Listing Decision: Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2016)
Revision Status Revised
Sources: Agriculture | Drainage/Filling Of Wetlands | Grazing-Related Sources | Irrigated Crop Production | Logging Road Construction/Maintenance | Road Construction | Silviculture
TMDL Name: Klamath River Nutrients, Temperature, DO, and Microcystin.
TMDL Project Code: 97
Date TMDL Approved by USEPA: 12/28/2010
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the section 303(d) list under sections 2.2 and 4.1 of the Listing Policy. Under section 4.1 of the Policy, a minimum of one line of evidence is needed to assess listing status. Fifty-one lines of evidence are available in the administrative record to assess this pollutant.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list (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) The Klamath River TMDL confirmed the nutrient impairment and that a nutrient load reduction was necessary to meet water quality standards. (4) The Klamath River TMDL has been approved by the North Coast Regional Water Quality Control Board in March 2010 and approved by USEPA on December 28, 2010. (5) Pursuant to section 4.11 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 removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
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 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 109635
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105FS0416)
Temporal Representation: The samples were collected between the dates of 2013-09-24 and 2013-09-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 118869
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
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: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0193)
Temporal Representation: The samples were collected between the dates of 2012-08-29 and 2012-08-29
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 118332
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0097)
Temporal Representation: The samples were collected between the dates of 2014-07-22 and 2014-07-22
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105439
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-04-30 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 44029
 
Pollutant: Nitrite as Nitrite NO2
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: Water Board staff assessed SWAMP data for Klamath River HU, Middle HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Nitrite as N.
Data Reference: Statewide Perennial Streams Assessment 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 Title 22
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA, Scott River to Trinity River was collected at 1 monitoring site [ Grider Creek - 105PS0043 ]
Temporal Representation: Data was collected on a single day 9/17/2008.
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 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 42802
 
Pollutant: Nitrite as Nitrite NO2
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, Middle HA and Lower HA, Scott River to Trinity River 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 Title 22
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 112744
 
Pollutant: Nitrogen, Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR0906)
Temporal Representation: The samples were collected between the dates of 2014-08-12 and 2014-08-12
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 107511
 
Pollutant: Nitrogen, Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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 DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Nitrate as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR0901)
Temporal Representation: The samples were collected between the dates of 2014-07-23 and 2014-08-11
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 106740
 
Pollutant: Nitrogen, Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR1004)
Temporal Representation: The samples were collected between the dates of 2014-07-23 and 2014-07-23
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105447
 
Pollutant: Nitrogen, 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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-03-05
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105448
 
Pollutant: Nitrogen, 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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-02-27
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105449
 
Pollutant: Nitrogen, 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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-03-05
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101572
 
Pollutant: Nitrogen, Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105BVCAGC)
Temporal Representation: The samples were collected between the dates of 2010-09-21 and 2010-09-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113828
 
Pollutant: Nitrogen, Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR0906)
Temporal Representation: The samples were collected between the dates of 2014-08-12 and 2014-08-12
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 118273
 
Pollutant: Nitrogen, Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR1004)
Temporal Representation: The samples were collected between the dates of 2014-07-23 and 2014-07-23
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 112171
 
Pollutant: Nitrogen, Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-03-05
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113717
 
Pollutant: Nitrogen, Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR0901)
Temporal Representation: The samples were collected between the dates of 2014-08-11 and 2014-08-11
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 112168
 
Pollutant: Nitrogen, Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-03-05
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 112170
 
Pollutant: Nitrogen, Nitrite
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for Nitrite as N is 1.0 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-02-27
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 119858
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR1004)
Temporal Representation: The samples were collected between the dates of 2014-07-23 and 2014-07-23
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105507
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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 DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR0901)
Temporal Representation: The samples were collected between the dates of 2014-07-23 and 2014-08-11
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 107028
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR0906)
Temporal Representation: The samples were collected between the dates of 2014-08-12 and 2014-08-12
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 114599
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105BVCAGC)
Temporal Representation: The samples were collected between the dates of 2010-09-21 and 2010-09-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 114137
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105FS0416)
Temporal Representation: The samples were collected between the dates of 2013-09-24 and 2013-09-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103333
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0193)
Temporal Representation: The samples were collected between the dates of 2012-08-29 and 2012-08-29
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 106043
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0097)
Temporal Representation: The samples were collected between the dates of 2014-07-22 and 2014-07-22
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 112164
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0267)
Temporal Representation: The samples were collected between the dates of 2014-07-21 and 2014-07-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113849
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113852
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-08-20 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113856
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 34553
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The sample does not exceed the water USEPA Temperature and pH-Dependent values of the CCC (Chronic Criterion) for Fish Early Life Stages Present for ammonia. The datum is reported as a non-detect limit. The non-detect 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: Statewide Perennial Streams Assessment 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: Samples were collected at 105PS0043 (Grider Creek).
Temporal Representation: The sample was collected on 9/17/2008.
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 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 34515
 
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. 2 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 105KLAMWP (Klamath River at Weitchpec).
Temporal Representation: Samples collected between 11/14/2007 and 2/26/2008.
Environmental Conditions:
QAPP Information: SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 119906
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
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: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0267)
Temporal Representation: The samples were collected between the dates of 2014-07-21 and 2014-07-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 119661
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
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: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0193)
Temporal Representation: The samples were collected between the dates of 2012-08-29 and 2012-08-29
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113570
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0097)
Temporal Representation: The samples were collected between the dates of 2014-07-22 and 2014-07-22
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 114093
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105FS0416)
Temporal Representation: The samples were collected between the dates of 2013-09-24 and 2013-09-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113850
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113857
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113853
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117036
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0193)
Temporal Representation: The samples were collected between the dates of 2012-08-29 and 2012-08-29
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105163
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0267)
Temporal Representation: The samples were collected between the dates of 2014-07-21 and 2014-07-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 112733
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105FS0416)
Temporal Representation: The samples were collected between the dates of 2013-09-24 and 2013-09-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101746
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0097)
Temporal Representation: The samples were collected between the dates of 2014-07-22 and 2014-07-22
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113858
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113854
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-08-20 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113851
 
Pollutant: Nitrogen, ammonia (Total Ammonia)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Ammonia as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 3685
 
Pollutant: Nutrients
LOE Subgroup: Pollutant-Water
Matrix: Not Specified
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: This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Unknown
Temporal Representation: Unknown
Environmental Conditions: Unknown
QAPP Information: Unknown
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 7479
 
Pollutant: Nutrients
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: Surveys of fish and game biologists/other professionals
Data Used to Assess Water Quality: Per the Klamath National Forest's Watershed Condition Assessment for Thompson Creek (Boland 2001, Attachment A), there is minor, less than year-round impairment of beneficial uses within the Thompson Creek Watershed (less than 20% of the surface waters, less than 60 days in aggregate) due to physical, biological, or chemical impacts associated with nutrients. The Klamath National Forest rated the nutrient water quality of Thompson Creek with a moderate integrity/functioning rank.
Data Reference: Attachment A: R5 Watershed Condition Assessment Data Summary. Klamath National Forest
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance, or that otherwise adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Assessment was for the Thompson Creek Watershed.
Temporal Representation: The time period during which the Assessment was conducted is unknown.
Environmental Conditions: It is unknown if any environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) are related to these data.
QAPP Information: The Assessment was conducted by professionals and local resource specialists of the U.S. Forest Service (USFS 2000). Local resource specialists include hydrologists, geologists, soil scientist, and biologists familiar with the target watershed. Other quality assurance information associated with the Assessment is unknown.
QAPP Information Reference(s): Rating Watershed Condition: Reconnaissance Level Assessment for the National Forests of the Pacific Southwest Region. USDA Forest Service, Pacific Southwest Region. June, 2000. Region 5 Watershed Condition Assessment - Process Paper
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 7478
 
Pollutant: Nutrients
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: Surveys of fish and game biologists/other professionals
Data Used to Assess Water Quality: Per the Klamath National Forest's Watershed Condition Assessment for Grider Creek (Boland 2001, Attachment A), there is minor, less than year-round impairment of beneficial uses within the Grider Creek Watershed (less than 20% of the surface waters, less than 60 days in aggregate) due to physical, biological, or chemical impacts associated with nutrients. The Klamath National Forest rated the nutrient water quality of Grider Creek with a moderate integrity/functioning rank.
Data Reference: Attachment A: R5 Watershed Condition Assessment Data Summary. Klamath National Forest
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance, or that otherwise adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Assessment was for the Grider Creek Watershed.
Temporal Representation: The time period during which the Assessment was conducted is unknown.
Environmental Conditions: It is unknown if any environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) are related to these data.
QAPP Information: The Assessment was conducted by professionals and local resource specialists of the U.S. Forest Service (USFS 2000). Local resource specialists include hydrologists, geologists, soil scientist, and biologists familiar with the target watershed. Other quality assurance information associated with the Assessment is unknown.
QAPP Information Reference(s): Rating Watershed Condition: Reconnaissance Level Assessment for the National Forests of the Pacific Southwest Region. USDA Forest Service, Pacific Southwest Region. June, 2000. Region 5 Watershed Condition Assessment - Process Paper
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 7476
 
Pollutant: Nutrients
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: Surveys of fish and game biologists/other professionals
Data Used to Assess Water Quality: Per the Klamath National Forest's Watershed Condition Assessment for Clear Creek (Boland 2001, Attachment A), there is minimal to no impairment of beneficial uses in the Clear Creek watershed (less than 20% of the surface waters at any time) due to physical, biological, or chemical impacts associated with nutrients. The Klamath National Forest rated the nutrient water quality of Clear Creek with a high integrity/functioning rank.
Data Reference: Attachment A: R5 Watershed Condition Assessment Data Summary. Klamath National Forest
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance, or that otherwise adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Assessment was for the Clear Creek Watershed.
Temporal Representation: The time period during which the Assessment was conducted is unknown.
Environmental Conditions: It is unknown if any environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) are related to these data.
QAPP Information: The Assessment was conducted by professionals and local resource specialists of the U.S. Forest Service. Local resource specialists include hydrologists, geologists, soil scientist, and biologists familiar with the target watershed. Other quality assurance information associated with the Assessment is unknown.
QAPP Information Reference(s): Rating Watershed Condition: Reconnaissance Level Assessment for the National Forests of the Pacific Southwest Region. USDA Forest Service, Pacific Southwest Region. June, 2000. Region 5 Watershed Condition Assessment - Process Paper
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 26296
 
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 | Warm Freshwater Habitat | Wildlife Habitat
 
Number of Samples: 39
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 39 ammonia as nitrogen samples collected from 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).
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 taken as grab samples in well-mixed flows in glides or riffles from 3 sampling locations in the mainstem Klamath River, as follows: (1) at Seiad Valley (SWAMP Station ID 105KLAMSI), (2) at Orleans (SWAMP Station ID 105KLAMOR), and (3) at Weitchpec above the confluence with the Trinity River (SWAMPT Station ID 105KLAMWP).
Temporal Representation: At the Seiad Valley site, samples were collected over 16 site visits from March 2001 to June 2005. At the Orleans site, samples were collected over 5 site visits from October 2002 to June 2003. At the Weitchpec site, samples were collected over 18 visits from March 2002 to June 2003. The site visits corresponded to fall, winter, spring and early summer 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 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105607
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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 DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR0901)
Temporal Representation: The samples were collected between the dates of 2014-07-23 and 2014-08-11
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104854
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105BVCAGC)
Temporal Representation: The samples were collected between the dates of 2010-09-21 and 2010-09-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 106867
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR0906)
Temporal Representation: The samples were collected between the dates of 2014-08-12 and 2014-08-12
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101784
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed DFW_ABL_Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for DFW_ABL_Monitoring.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105CR1004)
Temporal Representation: The samples were collected between the dates of 2014-07-23 and 2014-07-23
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 43984
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
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: Water Board staff assessed SWAMP data for Klamath River HU, Middle HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference: Statewide Perennial Streams Assessment 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 Title 22
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA, Scott River to Trinity River was collected at 1 monitoring site [ Grider Creek - 105PS0043 ]
Temporal Representation: Data was collected on a single day 9/17/2008.
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 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 43032
 
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, Middle HA and Lower HA, Scott River to Trinity River 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 Title 22
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Lower HA, Klamath Glen HSA was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP ]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105438
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-04-24 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 119617
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
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: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0267)
Temporal Representation: The samples were collected between the dates of 2014-07-21 and 2014-07-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 71297, Nutrients
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 105437
 
Pollutant: Nitrate/Nitrite (Nitrite + Nitrate as N)
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Water Quality Control Plan, North Coast Basin is 10.0 mg/L (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-04-24 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
75877
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Organic Enrichment/Low Dissolved Oxygen
Final Listing Decision: Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2016)
Revision Status Revised
Sources: Agriculture | Drainage/Filling Of Wetlands | Grazing-Related Sources | Irrigated Crop Production | Logging Road Construction/Maintenance | Road Construction | Silviculture
TMDL Name: Klamath River Nutrients, Temperature, DO, and Microcystin.
TMDL Project Code: 97
Date TMDL Approved by USEPA: 12/28/2010
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the section 303(d) list under sections 2.2 and 4.1 of the Listing Policy. Under section 4.1 of the Policy, a minimum of one line of evidence is needed to assess listing status. Six lines of evidence are available in the administrative record to assess this pollutant.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list (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) The Klamath River TMDL confirmed the dissolved oxygen impairment in the mainstem Klamath River from the Scott River to the Trinity River and that a nutrient load reduction was necessary to meet water quality standards. (4) The Klamath River TMDL has been approved by the North Coast Regional Water Quality Control Board in March 2010 and approved by USEPA on December 28, 2010. (5) 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 the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
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 75877, Organic Enrichment/Low Dissolved Oxygen
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 3684
 
Pollutant: Organic Enrichment/Low Dissolved Oxygen
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 pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Unknown
Temporal Representation: Unknown
Environmental Conditions: Unknown
QAPP Information: Unknown
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 75877, Organic Enrichment/Low Dissolved Oxygen
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 100779
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 5
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 5 samples exceeded the water quality standard for dissolved oxygen. Data range from 7.3 - 11.6 mg/L.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The dissolved oxygen shall conform to the values listed in Table 3-1a which states that the water quality objective for dissolved oxygen in the mainstem Klamath River represent natural background conditions due only to non-anthropogenic sources and a natural flow regime. The site-specific dissolved oxygen objective for the mainstem Klamath River the Scott River to upstream Hoopa-California boundary is 90% year round.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Table 7.4 of the Staff Report for the Proposed Site-Specific Dissolved Oxygen Objectives for the Klamath River in California (NCRWQCB 2010) presents the dissolved oxygen concentrations associated with the dissolved oxygen percent saturation objective. The dissolved oxygen concentrations were calculated utilizing natural temperatures from the Klamath Temperature TMDL model results. Thus, the following dissolved oxygen concentrations reflect natural background dissolved oxygen conditions in the mainstem Klamath River at Portuguese Creek River Access: 10.0 mg/L in July, 11.6 mg/L in November, 11.6 mg/L in April, 7.3 mg/L in September, and 11.5 mg/L in March.
Guideline Reference: Final Staff Report for the Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrient, and Microcystin Impairments in California the Proposed Site Specific Dissolved Oxygen Objectives for the Klamath River in California and the Klamath River and Lost River Implementation Plans.
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Klamath River at Portuguese Creek River Access (105KL6111).
Temporal Representation: The samples were collected between the date 03/05/2013 - 11/19/2013.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. 
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program.  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75877, Organic Enrichment/Low Dissolved Oxygen
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 100780
 
Pollutant: Oxygen, Dissolved
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 the data for this water body to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for dissolved oxygen. Data range from 9.4 - 13.3 mg/L.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The dissolved oxygen shall conform to the values listed in Table 3-1a which states that the water quality objective for dissolved oxygen in the mainstem Klamath River represent natural background conditions due only to non-anthropogenic sources and a natural flow regime. The site-specific dissolved oxygen objective for the mainstem Klamath River from Scott River to upstream Hoopa-California boundary is 90% year round.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Table 7.4 of the Staff Report for the Proposed Site-Specific Dissolved Oxygen Objectives for the Klamath River in California (NCRWQCB 2010) presents the dissolved oxygen concentrations associated with the dissolved oxygen percent saturation objective. The dissolved oxygen concentrations were calculated utilizing natural temperatures from the Klamath Temperature TMDL model results. Thus, the following dissolved oxygen concentrations reflect natural background dissolved oxygen conditions in the mainstem Klamath River above Orleans: 11.6 mg/L in October, 9.4 mg/L in August, and 13.3 mg/L in February.
Guideline Reference: Final Staff Report for the Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrient, and Microcystin Impairments in California the Proposed Site Specific Dissolved Oxygen Objectives for the Klamath River in California and the Klamath River and Lost River Implementation Plans.
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Klamath River above Orleans
Access (105KL2814).
Temporal Representation: The samples were collected between the date 02/27/2013 - 10/23/2013.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. 
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program.  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75877, Organic Enrichment/Low Dissolved Oxygen
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 34038
 
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 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): The site specific objective for the mainstem Klamath River from Hoopa to Turwar is 90% September 1 through May 31 and 85% June 1 through August 31.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Table 7.4 of the Staff Report for the Proposed Site Specific Dissolved Oxygen Objectives for the Klamath River in California (NCRWQCB 2010) presents the dissolved oxygen concentrations associated with the dissolved oxygen percent saturation objective. The dissolved oxygen concentrations were calculated utilizing natural temperatures from the Klamath Temperature TMDL model results. Thus, the following dissolved oxygen concentrations reflect natural background dissolved oxygen conditions in the mainstem Klamath River from Hoopa to Turwar's Upstream Trinity River station: 10.0 mg/L in November, 10.6 mg/L in February, 9.5 mg/L in April, and 7.0 mg/L in July.
Guideline Reference: 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: Samples were collected from the 105KLAMWP station.
Temporal Representation: One sample was collected in 2007 and three samples were collected in 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 75877, Organic Enrichment/Low Dissolved Oxygen
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101349
 
Pollutant: Oxygen, Dissolved
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: If DO concentrations fall below the numeric objectives set forth by the Basin Plan (2018). If NO, then the waterbody is supporting that beneficial use, if YES, then that waterbody is considered impaired.
Data Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Dissolved oxygen (DO) concentrations shall conform to the numeric objectives expressed in section 3.3.5.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are present in the watershed (Carter & Kirk 2008). Rearing for all three salmonid species occurs during all months of the year, and spawning occurs September through March for Chinook, October through February for coho, and September through May for steelhead (Carter & Kirk 2008).
Guideline Reference: Fish and Fishery Resources of the Klamath River Basin. Appendix 5 of the Klamath River TMDLs.
Guideline Reference: Final Staff Report for the Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrient, and Microcystin Impairments in California the Proposed Site Specific Dissolved Oxygen Objectives for the Klamath River in California and the Klamath River and Lost River Implementation Plans.
 
Spatial Representation: Information pertains to the following water bodies: Klamath River HU, Middle HA, Mainstem Klamath River from Iron Gate Dam to Scott River; Klamath River HU, Middle HA, select tributaries to Klamath River from Iron Gate Dam to Scott River; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Middle Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Horse Creek and its Tributaries from the headwaters to confluence with Middle Creek; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Seiad Creek and its Tributaries from the headwaters to Williams Gulch; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Walker Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Grider Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Happy Camp HSA, China Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Happy Camp HSA, Thompson Creek and its Tributaries (except Cedar Creek and its tributaries); Klamath River HU, Middle Klamath River HA, Happy Camp HSA, Cade Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Happy Camp HSA, Doolittle Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Happy Camp HSA, East Fork Indian Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Happy Camp HSA, Indian Creek and its Tributaries from the headwaters to the confluence with the South Fork Indian Creek; Klamath River HU, Middle Klamath River HA, Happy Camp HSA, South Fork Indian Creek and its Tributaries (except Twin Valley Creek and its Tributaries); Klamath River HU, Middle Klamath River HA, Ukonom HSA, Little Grider Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Ukonom HSA, Oak Flat Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Ukonom HSA, East Fork Elk Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Ukonom HSA, Elk Creek and its Tributaries from Bear Creek to the mouth (except East Fork Elk Creek and its tributaries); Klamath River HU, Middle Klamath River HA, Ukonom HSA, Clear Creek and its Tributaries from the confluence with Tenmile Creek to the mouth (except Tenmile Creek and its tributaries & South Fork Clear Creek and its tributaries); Klamath River HU, Middle Klamath River HA, Ukonom HSA, South Fork Clear Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Ukonom HSA, Titus Creek And its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, Independence Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Ukonom HSA, King Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Ukonom HSA, Ukonom Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Ukonom HSA, Swillup Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Ukonom HSA, Dillon Creek and its Tributaries (except the North Fork Dillon Creek above Vann Creek and its Tributaries).
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 75877, Organic Enrichment/Low Dissolved Oxygen
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 133827
 
Pollutant: Oxygen, Dissolved
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 the data for this water body to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for dissolved oxygen. Data range from 10.4 - 12.4 mg/L.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The dissolved oxygen shall conform to the values listed in Table 3-1a which states that the water quality objective for dissolved oxygen in the mainstem Klamath River represent natural background conditions due only to non-anthropogenic sources and a natural flow regime. The site-specific dissolved oxygen objective for the mainstem Klamath River from downstream Hoopa-California boundary to Tuwar is 85% June 1st - August 1st and 90% September 1st - May 31st.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: Table 7.4 of the Staff Report for the Proposed Site-Specific Dissolved Oxygen Objectives for the Klamath River in California (NCRWQCB 2010) presents the dissolved oxygen concentrations associated with the dissolved oxygen percent saturation objective. The dissolved oxygen concentrations were calculated utilizing natural temperatures from the Klamath Temperature TMDL model results. Thus, the following dissolved oxygen concentrations reflect natural background dissolved oxygen conditions in the mainstem Klamath River at Weitchpec: 12.3 mg/L in March, 12.4 mg/L in April, 10.4 mg/L in August and 11.2 mg/L in October.
Guideline Reference: Final Staff Report for the Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrient, and Microcystin Impairments in California the Proposed Site Specific Dissolved Oxygen Objectives for the Klamath River in California and the Klamath River and Lost River Implementation Plans.
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Klamath River at Weitchpec (105KL2057).
Temporal Representation: The samples were collected between the date 03/05/2013 - 10/23/2013.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. 
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program.  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
72936
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Temperature, water
Final Listing Decision: Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2016)
Revision Status Revised
Sources: Agriculture | Drainage/Filling Of Wetlands | Flow Alteration/Regulation/Modification | Grazing-Related Sources | Irrigated Crop Production | Logging Road Construction/Maintenance | Removal of Riparian Vegetation | Road Construction | Silviculture
TMDL Name: Klamath River Nutrients, Temperature, DO, and Microcystin.
TMDL Project Code: 97
Date TMDL Approved by USEPA: 12/28/2010
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal on the CWA section 303(d) List under sections 2.2 and 4.11 of the Listing Policy. Under 4.11 of the Policy, a minimum of one line of evidence is needed to assess listing status.

Thirty lines of evidence are available in the administrative record to assess this pollutant.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that:

(1) The data used satisfies the data quality requirements of section 6.1.4 of the Policy.

(2) Portuguese Creek and its Tributaries (LOE 31588), Cedar Creek and its Tributaries (LOE 31584), Twin Valley Creek and its Tributaries (LOE 31590), North Fork Dillon Creek and its Tributaries from the headwaters to Vann Creek (LOE 31591), Canyon Creek and its Tributaries from the headwaters to confluence with Seiad Creek (LOE 31583), Elk Creek and its Tributaries from the headwaters to Bear Creek (LOEs 31586, 101039, 101040), Tenmile Creek and its Tributaries (LOE 31589), Clear Creek and its Tributaries from the headwaters to the confluence with Tenmile Creek (LOE 31585), and Fort Goff Creek and its Tributaries (LOE 31587) 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) MWMTs in Thompson Creek (LOE 7464), Grider Creek (LOE 7463), and Clear Creek (LOE 7462) exceed the evaluation guideline.

(4) The Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrients, and Microcystin Impairments in California were approved by USEPA on December 28, 2010. The staff report confirmed temperature impairments in the Klamath River basin.

(5) 303(d) listing determinations made prior to 2006 were not held in an assessment database. LOE 3683 is a placeholder for the 303(d) listing data and information for all streams in this water body from a previous assessment cycle that was initially utilized to make this listing determination.

(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 water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31583
 
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, Middle Klamath River HA, Seiad Valley HSA, Canyon Creek and its Tributaries from the headwaters to confluence with Seiad 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, Middle Klamath River HA, Seiad Valley HSA, Canyon Creek and its Tributaries from the headwaters to confluence with Seiad 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, Middle Klamath River HA, Seiad Valley HSA, Canyon Creek and its Tributaries from the headwaters to confluence with Seiad Creek water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Canyon Creek and its Tributaries from the headwaters to confluence with Seiad 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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101039
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 10.8 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Elk Creek at Hummingbird Cr. (105FS0416).
Temporal Representation: The samples were collected between the dates of 9/24/2013.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31588
 
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, Middle Klamath River HA, Happy Camp HSA, Portuguese Creek and its Tributaries 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, Middle Klamath River HA, Happy Camp HSA, Portuguese Creek and its Tributaries 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, Middle Klamath River HA, Happy Camp HSA, Portuguese Creek and its Tributaries water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Happy Camp HSA, Portuguese Creek and its Tributaries.
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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31590
 
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, Middle Klamath River HA, Happy Camp HSA, Twin Valley Creek and its Tributaries 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, Middle Klamath River HA, Happy Camp HSA, Twin Valley Creek and its Tributaries 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, Middle Klamath River HA, Happy Camp HSA, Twin Valley Creek and its Tributaries water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Happy Camp HSA, Twin Valley Creek and its Tributaries.
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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31589
 
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, Middle Klamath River HA, Ukonom HSA, Tenmile Creek and its Tributaries 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, Middle Klamath River HA, Ukonom HSA, Tenmile Creek and its Tributaries 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, Middle Klamath River HA, Ukonom HSA, Tenmile Creek and its Tributaries water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Ukonom HSA, Tenmile Creek and its Tributaries.
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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31584
 
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, Middle Klamath River HA, Happy Camp HSA, Cedar Creek and its Tributaries 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, Middle Klamath River HA, Happy Camp HSA, Cedar Creek and its Tributaries 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, Middle Klamath River HA, Happy Camp HSA, Cedar Creek and its Tributaries water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Happy Camp HSA, Cedar Creek and its Tributaries.
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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31585
 
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, Middle Klamath River HA, Ukonom HSA, Clear Creek and its Tributaries from the headwaters to the confluence with Tenmile 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, Middle Klamath River HA, Ukonom HSA, Clear Creek and its Tributaries from the headwaters to the confluence with Tenmile 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, Middle Klamath River HA, Ukonom HSA, Clear Creek and its Tributaries from the headwaters to the confluence with Tenmile Creek water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Ukonom HSA, Clear Creek and its Tributaries from the headwaters to the confluence with Tenmile 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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31591
 
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, Middle Klamath River HA, Ukonom HSA, North Fork Dillon Creek and its Tributaries from the headwaters to Vann 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, Middle Klamath River HA, Ukonom HSA, North Fork Dillon Creek and its Tributaries from the headwaters to Vann 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, Middle Klamath River HA, Ukonom HSA, North Fork Dillon Creek and its Tributaries from the headwaters to Vann Creek water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Ukonom HSA, North Fork Dillon Creek and its Tributaries from the headwaters to Vann 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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31587
 
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, Middle Klamath River HA, Happy Camp HSA, Fort Goff Creek and its Tributaries 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, Middle Klamath River HA, Happy Camp HSA, Fort Goff Creek and its Tributaries 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, Middle Klamath River HA, Happy Camp HSA, Fort Goff Creek and its Tributaries water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Happy Camp HSA, Fort Goff Creek and its Tributaries.
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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31524
 
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): Per the Klamath River TMDL, water temperatures in many areas of the Klamath River watershed do not reflect natural conditions (NCRWQCB 2010). EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Coho, steelhead, and Chinook are present in the watershed (Carter & Kirk 2008). Rearing for all three salmonid species occurs during all months of the year, and spawning occurs September through March for Chinook, October through February for coho, and September through May for steelhead (Carter & Kirk 2008).
Guideline Reference: Fish and Fishery Resources of the Klamath River Basin. Appendix 5 of the Klamath River TMDLs.
Guideline Reference: Final Staff Report for the Klamath River Total Maximum Daily Loads (TMDLs) Addressing Temperature, Dissolved Oxygen, Nutrient, and Microcystin Impairments in California the Proposed Site Specific Dissolved Oxygen Objectives for the Klamath River in California and the Klamath River and Lost River Implementation Plans.
 
Spatial Representation: Information pertains to the following water bodies: Klamath River HU, Middle HA, Mainstem Klamath River from Iron Gate Dam to Scott River; Klamath River HU, Middle HA, select tributaries to Klamath River from Iron Gate Dam to Scott River; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Middle Creek and its Tributaries; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Horse Creek and its Tributaries from the headwaters to confluence with Middle Creek; Klamath River HU, Middle Klamath River HA, Seiad Valley HSA, Seiad Creek and its Tributaries from the headwaters to Williams Gulch; Klamath River HU,Middle Klamath River HA, Seiad Valley HSA, Walker Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Seiad Valley HSA, Grider Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Happy Camp HSA, China Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Happy Camp HSA, Thompson Creek and its Tributaries (except Cedar Creek and its tributaries); Klamath River HU,Middle Klamath River HA, Happy Camp HSA, Cade Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Happy Camp HSA, Doolittle Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Happy Camp HSA, East Fork Indian Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Happy Camp HSA, Indian Creek and its Tributaries from the headwaters to the confluence with the South Fork Indian Creek; Klamath River HU,Middle Klamath River HA, Happy Camp HSA, South Fork Indian Creek and its Tributaries (except Twin Valley Creek and its Tributaries); Klamath River HU,Middle Klamath River HA, Ukonom HSA, Little Grider Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, Oak Flat Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, East Fork Elk Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, Elk Creek and its Tributaries from Bear Creek to the mouth (except East Fork Elk Creek and its tributaries); Klamath River HU,Middle Klamath River HA, Ukonom HSA, Clear Creek and its Tributaries from the confluence with Tenmile Creek to the mouth (except Tenmile Creek and its tributaries & South Fork Clear Creek and its tributaries); Klamath River HU,Middle Klamath River HA, Ukonom HSA, South Fork Clear Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, Titus Creek And its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, Independence Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, King Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, Ukonom Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, Swillup Creek and its Tributaries; Klamath River HU,Middle Klamath River HA, Ukonom HSA, Dillon Creek and its Tributaries (except the North Fork Dillon Creek above Vann Creek and its Tributaries).
Temporal Representation: Data are reflective 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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 43227
 
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, Middle HA and Lower HA, Scott River to Trinity River 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 June-August. The lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C and applies September-May in this water body. See LOE ID 31524 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, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 7464
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat
 
Number of Samples: 7
Number of Exceedances: 7
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The natural receiving water temperature of Thompson Creek has been altered by human activities. This is demonstrated by exceedances of the amount of the watershed subject to human disturbance (see LOE 21163), and the estimated accelerated mass wasting and soil erosion from timber harvest, roads, and wildfire (see LOE 21164). Activities that remove or reduce shade-producing vegetation, or that result in a discharge of sediment to a stream, can increase stream temperatures. In order to determine if water temperatures adversely affect salmonids, the most sensitive beneficial use in Thompson Creek, temperature data were analyzed. Of the 7 MWMT values calculated from near-continuous summertime temperature samples collected in Thompson Creek, all 7 exceed the evaluation guideline. MWMT values range from 17.0 to 20.3 C. Data are summarized by the Klamath National Forest (KNF 2008).
Data Reference: Stream Temperatures, Klamath River Basin. Includes data for Thompson Creek, Grider Creek, Clear Creek, Wooley Creek, North Fork Salmon River, and South Fork Salmon River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased by more than 5 F above natural receiving water temperature. At no time or place shall the temperature of WARM intrastate waters be increased more than 5 F above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: If the natural receiving water temperature has been altered, or if alternation is unknown, the evaluation guideline to determine adverse affect on the most sensitive beneficial use (in this case, salmonids) is as follows. Per "U.S. EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards" (USEPA 2003), the U.S. EPA recommends a criterion for the protection of moderate to high density summertime salmon and trout juvenile rearing (i.e., core juvenile rearing) of a maximum weekly maximum temperature (MWMT) of 16 degrees C. The MWMT is also known as the maximum 7-day average of daily maximums (7DADM). The 16 degrees C MWMT criterion is recommended to (1) safely protect juvenile salmon and trout from lethal temperatures; (2) provide upper optimal conditions for juvenile growth under limited food during the period of summer maximum temperatures and optimal temperatures for other times of the growth season; (3) avoid temperatures where juvenile salmon and trout are at a competitive disadvantage with other fish; (4) protect against temperature induced elevated disease rates; and (5) provide temperatures that studies show juvenile salmon and trout prefer and are found in high densities.
Guideline Reference: EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.
 
Spatial Representation: Temperature samples were collected from 2 locations in the mainstem Thompson Creek as follows: (1) under the 18N02 Bridge; and (2) above the 18N02 Bridge.
Temporal Representation: Temperature samples were collected (1) under the 18N02 Bridge from late April to mid-October 2001, from late April to early October 2002, from late May to early November 2003, from late May to mid-October 2004, and from June 2005 through October 2006; and (2) above the 18N02 Bridge from mid-July to late October 2004.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to the temperature data.
QAPP Information: Temperature data was collected in accordance with the quality assurance guidelines described by Schuyler (2008).
QAPP Information Reference(s): Memorandum from John Schuyler, Klamath Nation Forest, to Rebecca Fitzgerald, North Coast Regional Water Quality Control Board, Regarding the 303(d) DeListing Request
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 7463
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat
 
Number of Samples: 10
Number of Exceedances: 10
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The natural receiving water temperature of Grider Creek has been altered by human activities. This is demonstrated by exceedances of the amount of the watershed subject to human disturbance (see LOE 21166), and the estimated accelerated mass wasting and soil erosion from timber harvest, roads, and wildfire (see LOE 21167). Activities that remove or reduce shade-producing vegetation, or that result in a discharge of sediment to a stream, can increase stream temperatures. In order to determine if water temperatures adversely affect salmonids, the most sensitive beneficial use in Grider Creek, temperature data were analyzed. Of the 10 MWMT values calculated from near-continuous summertime temperature samples collected in Grider Creek, all 10 exceed the evaluation guideline. MWMT values range from 19.7 to 22.3 C. Data are summarized by the Klamath National Forest (KNF 2008).
Data Reference: Stream Temperatures, Klamath River Basin. Includes data for Thompson Creek, Grider Creek, Clear Creek, Wooley Creek, North Fork Salmon River, and South Fork Salmon River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased by more than 5 F above natural receiving water temperature. At no time or place shall the temperature of WARM intrastate waters be increased more than 5 F above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: If the natural receiving water temperature has been altered, or if alternation is unknown, the evaluation guideline to determine adverse affect on the most sensitive beneficial use (in this case, salmonids) is as follows. Per "U.S. EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards" (USEPA 2003), the U.S. EPA recommends a criterion for the protection of moderate to high density summertime salmon and trout juvenile rearing (i.e., core juvenile rearing) of a maximum weekly maximum temperature (MWMT) of 16 degrees C. The MWMT is also known as the maximum 7-day average of daily maximums (7DADM). The 16 degrees C MWMT criterion is recommended to (1) safely protect juvenile salmon and trout from lethal temperatures; (2) provide upper optimal conditions for juvenile growth under limited food during the period of summer maximum temperatures and optimal temperatures for other times of the growth season; (3) avoid temperatures where juvenile salmon and trout are at a competitive disadvantage with other fish; (4) protect against temperature induced elevated disease rates; and (5) provide temperatures that studies show juvenile salmon and trout prefer and are found in high densities.
Guideline Reference: EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.
 
Spatial Representation: Temperature samples were collected from 2 locations in the mainstem Grider Creek as follows: (1) at Karuk; and (2) 50 ft upstream of the 46N66 Bridge.
Temporal Representation: Temperature samples were collected (1) at Karuk from late March to mid-October 2006; and (2) upstream of the 46N66 Bridge from mid-June to early September 1998, from late June to early November 1999, from July 1 to mid-October 2000, from late April to mid-October 1001, from late April to early October 2002, from late May 2003 through October 2007 with 2 weeks not monitored in September 2005.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to the temperature data.
QAPP Information: Temperature data was collected in accordance with the quality assurance guidelines described by Schuyler (2008).
QAPP Information Reference(s): Memorandum from John Schuyler, Klamath Nation Forest, to Rebecca Fitzgerald, North Coast Regional Water Quality Control Board, Regarding the 303(d) DeListing Request
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 44117
 
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: Water Board staff assessed SWAMP data for Klamath River HU, Middle HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Water Temperature.
Data Reference: Statewide Perennial Streams Assessment 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 June-August. The lethal temperature evaluation guideline for salmonid spawning, egg incubation & fry emergence is 20C and applies September-May in this water body. See LOE ID 31524 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, Middle HA, Scott River to Trinity River was collected at 1 monitoring site [ Grider Creek - 105PS0043 ]
Temporal Representation: Data was collected on a single day 9/17/2008.
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 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 3683
 
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: Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference pre-2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Unknown
Temporal Representation: Unknown
Environmental Conditions: Unknown
QAPP Information: Unknown
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 7462
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Warm Freshwater Habitat | Wildlife Habitat
 
Number of Samples: 12
Number of Exceedances: 12
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: The natural receiving water temperature of Clear Creek has been altered by human activities. This is demonstrated by exceedances of the evaluation guidelines in the amount of the watershed subject to human disturbance (see LOE 21160), and the estimated accelerated mass wasting and soil erosion from timber harvest, roads, and wildfire (see LOE 21161). Activities that remove or reduce shade-producing vegetation, or that result in a discharge of sediment to a stream, can increase stream temperatures. In order to determine if water temperatures adversely affect salmonids, the most sensitive beneficial use in Clear Creek, temperature data were analyzed. Of the 12 MWMT values calculated from near-continuous summertime temperature samples collected in Clear Creek, all 12 exceed the evaluation guideline. MWMT values range from 19.8 to 23.2 C. Data are summarized by the Klamath National Forest (KNF 2008).
Data Reference: Stream Temperatures, Klamath River Basin. Includes data for Thompson Creek, Grider Creek, Clear Creek, Wooley Creek, North Fork Salmon River, and South Fork Salmon River
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased by more than 5 F above natural receiving water temperature. At no time or place shall the temperature of WARM intrastate waters be increased more than 5 F above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: If the natural receiving water temperature has been altered, or if alternation is unknown, the evaluation guideline to determine adverse affect on the most sensitive beneficial use (in this case, salmonids) is as follows. Per "U.S. EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards" (USEPA 2003), the U.S. EPA recommends a criterion for the protection of moderate to high density summertime salmon and trout juvenile rearing (i.e., core juvenile rearing) of a maximum weekly maximum temperature (MWMT) of 16 degrees C. The MWMT is also known as the maximum 7-day average of daily maximums (7DADM). The 16 degrees C MWMT criterion is recommended to (1) safely protect juvenile salmon and trout from lethal temperatures; (2) provide upper optimal conditions for juvenile growth under limited food during the period of summer maximum temperatures and optimal temperatures for other times of the growth season; (3) avoid temperatures where juvenile salmon and trout are at a competitive disadvantage with other fish; (4) protect against temperature induced elevated disease rates; and (5) provide temperatures that studies show juvenile salmon and trout prefer and are found in high densities.
Guideline Reference: EPA Region 10 Guidance for Pacific Northwest State and Tribal Temperature Water Quality Standards. EPA 910-B-03-002. U.S. Environmental Protection Agency Region 10 Office of Water, Seattle, WA.
 
Spatial Representation: Temperature samples were collected from 2 locations in the mainstem Clear Creek as follows: (1) 100 ft upstream of the South Fork Clear Creek; and (2) near the mouth, 150 ft upstream from the private bridge.
Temporal Representation: Temperature samples were collected (1) upstream of the South Fork Clear Creek from late May 1992 to mid-June 1994, and from early August through September 1994; (2) near the mouth from August 1 to early September 1997, from mid-June to mid-September 1998, from late June to early October 2000, from late April to mid-October 2001, from late April to early October 2002, and from late May 2003 to late October 2007.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to the temperature data.
QAPP Information: Temperature data was collected in accordance with the quality assurance guidelines described by Schuyler (2008).
QAPP Information Reference(s): Memorandum from John Schuyler, Klamath Nation Forest, to Rebecca Fitzgerald, North Coast Regional Water Quality Control Board, Regarding the 303(d) DeListing Request
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 21166
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Freshwater Replenishment | Preservation of Rare & Endangered Species | Wildlife Habitat
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: Land use information and location of sources
Data Used to Assess Water Quality: Per the Klamath National Forest (Boland 2001, Attachment F), 16% of the Grider Creek Watershed is a congressionally designated Wilderness Area. An additional 80% of the watershed is managed as late successional reserves, which limits management activities to actions that promote old-growth habitat. Less than 1% of the watershed is privately owned. This leaves, at a minimum, 3% to 4% of the watershed subject to disturbance activities. In order to determine if the 80% of the watershed in the late successional reserve has a concentration of disturbance in unstable areas, refugia, or riparian areas, North Coast Regional Water Board staff analyzed images from Google Earth of the Grider Creek Watershed (NCRWQCB 2008). Staff found that human disturbance has occurred in unstable areas (as evidenced by landslides and debris torrents) and in riparian areas (as evidenced by scoured channels).
Data Reference: Grider Creek Disturbance Images. Compiled by North Coast Regional Water Quality Control Board staff. October 13, 2008
  Attachment F: Supporting Narrative for Upslope, Channel and Habitat-associated Criteria (1-9) Rating Rationale. Klamath National Forest's Northern Province Category 1 Watersheds which meet "management-constrained" criteria
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased by more than 5 F above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: Human disturbance within a watershed can impact water temperature and alter natural conditions. Activities that remove or reduce shade-producing vegetation, or that result in a discharge of sediment to a stream, can increase stream temperatures. Per NOAA Fisheries (1996), the guideline for the properly functioning condition for disturbance history is for the entire watershed to be less than 15% disturbed with no concentration of disturbance in (1) unstable areas, (2) potentially unstable areas, (3) refugia, and/or (4) riparian areas. For areas under the Northwest Forest Plan (which includes the Upper South Fork Salmon River watershed), the guideline for the properly functioning condition for disturbance history is also for there to be at least 15% retention of late succession and old growth forest in the watershed.
Guideline Reference: Making Endangered Species Act Determinations of Effect for Individual or Group Actions at the Watershed Scale. Prepared by the National Oceanic and Atmospheric Administration National Marine Fisheries Service Environmental and Technical Services Division Habitat Conservation Branch
 
Spatial Representation: The disturbance and land use information was assessed for the entire Grider Creek Watershed.
Temporal Representation: The disturbance and land use information from the Klamath National Forest is current as of 2001. The images from Google Earth were taken from 2005 satellite images.
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: Klamath National Forest information was generated from GIS-based data sources of high quality and resolution.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 21160
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Freshwater Replenishment | Preservation of Rare & Endangered Species | Wildlife Habitat
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: Land use information and location of sources
Data Used to Assess Water Quality: More than 15% of the Clear Creek Watershed is subject to disturbance by human activities. Per the Klamath National Forest (Boland 2001, Attachment F), 70% of the watershed is a congressionally designated Wilderness Area. Less than 1% of the watershed is privately owned. This leaves 29% to 30% of the watershed subject to disturbance activities.
Data Reference: Attachment F: Supporting Narrative for Upslope, Channel and Habitat-associated Criteria (1-9) Rating Rationale. Klamath National Forest's Northern Province Category 1 Watersheds which meet "management-constrained" criteria
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased by more than 5 F above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: Human disturbance within a watershed can impact water temperature and alter natural conditions. Activities that remove or reduce shade-producing vegetation, or that result in a discharge of sediment to a stream, can increase stream temperatures. Per NOAA Fisheries (1996), the guideline for the properly functioning condition for disturbance history is for the entire watershed to be less than 15% disturbed with no concentration of disturbance in (1) unstable areas, (2) potentially unstable areas, (3) refugia, and/or (4) riparian areas. For areas under the Northwest Forest Plan (which includes the Upper South Fork Salmon River watershed), the guideline for the properly functioning condition for disturbance history is also for there to be at least 15% retention of late succession and old growth forest in the watershed.
Guideline Reference: Making Endangered Species Act Determinations of Effect for Individual or Group Actions at the Watershed Scale. Prepared by the National Oceanic and Atmospheric Administration National Marine Fisheries Service Environmental and Technical Services Division Habitat Conservation Branch
 
Spatial Representation: The disturbance and land use information was assessed for the entire Clear Creek Watershed.
Temporal Representation: The disturbance and land use information from the Klamath National Forest is current as of 2001.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Land use information was generated from GIS-based data sources of high quality and resolution.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 21163
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
Aquatic Life Use: Fish Migration | Fish Spawning | Freshwater Replenishment | Preservation of Rare & Endangered Species | Wildlife Habitat
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: Land use information and location of sources
Data Used to Assess Water Quality: More than 15% of the Thompson Creek Watershed is subject to disturbance by human activities. Per the Klamath National Forest (Boland 2001, Attachment F), 75% of the watershed is managed as late successional reserves, which limits management activities to actions that promote old-growth habitat. Less than 1% of the watershed is privately owned. This leaves, at a minimum, 24% to 25% of the watershed subject to disturbance activities.
Data Reference: Attachment F: Supporting Narrative for Upslope, Channel and Habitat-associated Criteria (1-9) Rating Rationale. Klamath National Forest's Northern Province Category 1 Watersheds which meet "management-constrained" criteria
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased by more than 5 F above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline: Human disturbance within a watershed can impact water temperature and alter natural conditions. Activities that remove or reduce shade-producing vegetation, or that result in a discharge of sediment to a stream, can increase stream temperatures. Per NOAA Fisheries (1996), the guideline for the properly functioning condition for disturbance history is for the entire watershed to be less than 15% disturbed with no concentration of disturbance in (1) unstable areas, (2) potentially unstable areas, (3) refugia, and/or (4) riparian areas. For areas under the Northwest Forest Plan (which includes the Upper South Fork Salmon River watershed), the guideline for the properly functioning condition for disturbance history is also for there to be at least 15% retention of late succession and old growth forest in the watershed.
Guideline Reference: Making Endangered Species Act Determinations of Effect for Individual or Group Actions at the Watershed Scale. Prepared by the National Oceanic and Atmospheric Administration National Marine Fisheries Service Environmental and Technical Services Division Habitat Conservation Branch
 
Spatial Representation: The disturbance and land use information was assessed for the entire Grider Creek Watershed.
Temporal Representation: The disturbance and land use information from the Klamath National Forest is current as of 2001.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Land use information was generated from GIS-based data sources of high quality and resolution.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101107
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 11.9 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Indian Creek above South Fork Indian Creek (105IN4395).
Temporal Representation: The samples were collected between the dates of 10/13/2010.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101038
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 10.8 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Burney Valley Creek above Granite Cr. (105BVCAGC).
Temporal Representation: The samples were collected between the dates of 9/21/2010.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101040
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for Temperature. Data range from 21.0 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Elk Creek above Copper Creek (105PS0097).
Temporal Representation: The samples were collected between the dates of 7/22/2014.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101104
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 10.4 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Baker Gulch above Indian Creek (105BG0886).
Temporal Representation: The samples were collected between the dates of 10/13/2010.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101105
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 10.4 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Indian Creek above Baker Gulch (105IN3286).
Temporal Representation: The samples were collected between the dates of 10/13/2010.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101106
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 12.3 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Indian Creek above Happy Camp (105IN1545).
Temporal Representation: The samples were collected between the dates of 10/13/2010.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101109
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 5
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 5 samples exceeded the water quality standard for Temperature. Data range from 6.4 - 23.3 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Klamath River above Orleans (105KL2814).
Temporal Representation: The samples were collected between the dates of 2/27/2013 - 12/3/2013.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101110
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 5
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 1 of 5 samples exceeded the water quality standard for Temperature. Data range from 7.2 - 24.3 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Klamath River at Portuguese Creek River Access (105KL6111).
Temporal Representation: The samples were collected between the dates of 3/5/2013 - 11/19/2013.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101111
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 11.3 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) South Fork Indian Creek above Indian Creek (105SI0473).
Temporal Representation: The samples were collected between the dates of 10/13/2010.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 101108
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 13.3 degrees C.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C. 
Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
 
Spatial Representation: The samples were collected at 1 monitoring site(s) Indian Creek below Luther Gulch (105IN2529).
Temporal Representation: The samples were collected between the dates of 10/13/2010.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program  
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 72936, Temperature, water
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 31586
 
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, Middle Klamath River HA, Ukonom HSA, Elk Creek and its Tributaries from the headwaters to Bear 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, Middle Klamath River HA, Ukonom HSA, Elk Creek and its Tributaries from the headwaters to Bear 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, Middle Klamath River HA, Ukonom HSA, Elk Creek and its Tributaries from the headwaters to Bear Creek water body meets the criteria for temperature reference water bodies, and thus, temperature conditions in this water body reflect natural conditions.
Guideline Reference: Klamath National Forest Sediment and Temperature Monitoring Plan and Quality Assurance Project Plan
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.
 
Spatial Representation: Information pertains to the Klamath River HU, Middle Klamath River HA, Ukonom HSA, Elk Creek and its Tributaries from the headwaters to Bear 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.
 
 
DECISION ID
100911
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Aldicarb
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3 of the Listing Policy. Under section 3.1 a single line(s) of evidence is necessary to assess listing status.

Nine lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objectives.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. None of the samples exceeded the objectives and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103993
 
Pollutant: Aldicarb
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 10 ug/L for an invertebrate (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103997
 
Pollutant: Aldicarb
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 10 ug/L for an invertebrate (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103994
 
Pollutant: Aldicarb
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 10 ug/L for an invertebrate (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103991
 
Pollutant: Aldicarb
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 10 ug/L for an invertebrate (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103990
 
Pollutant: Aldicarb
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 10 ug/L for an invertebrate (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103995
 
Pollutant: Aldicarb
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for aldicarb incorporated by reference in the Water Quality Control Plan, North Coast Basin is 3 ug/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103989
 
Pollutant: Aldicarb
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for aldicarb incorporated by reference in the Water Quality Control Plan, North Coast Basin is 3 ug/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103992
 
Pollutant: Aldicarb
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The California Maximum Contaminant Level for aldicarb incorporated by reference in the Water Quality Control Plan, North Coast Basin is 3 ug/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100911, Aldicarb
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103988
 
Pollutant: Aldicarb
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldicarb.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 10 ug/L for an invertebrate (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
101147
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Aldrin
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3 of the Listing Policy. Under section 3 a single line of evidence is necessary to assess listing status.

Seven lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. None of the samples exceeded the objectives and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 40977
 
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, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 107655
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 105KL2057).
Temporal Representation: Date for this waterbody was collected over the date range 2013-04-24 to 2013-04-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 40964
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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, Middle HA and Lower HA, Scott River to Trinity River 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 aldrin criterion maximum concentration to protect aquatic life in freshwater 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, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 119116
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 105KL2814).
Temporal Representation: Date for this waterbody was collected over the date range 2013-04-24 to 2013-04-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 106430
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 2 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 105KL6111).
Temporal Representation: Date for this waterbody was collected over the date range 2013-04-30 to 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 107654
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 105KL2057).
Temporal Representation: Date for this waterbody was collected over the date range 2013-04-24 to 2013-04-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 40912
 
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, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 116109
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 105KL2814).
Temporal Representation: Date for this waterbody was collected over the date range 2013-04-24 to 2013-04-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 116108
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 2 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 105KL6111).
Temporal Representation: Date for this waterbody was collected over the date range 2013-04-30 to 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103998
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aldrin.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L . This established criteria was divided by 2 in order to better represent a CMC value as specified in footnote g of Table (b)(1) of the California Toxics Rule, 2000.
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-04-24 and 2013-04-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 121381
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
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: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Aldrin. Data were collected for 1 fish species (1 composite(s) of Rainbow Trout each composed of 5 fish per composite).
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Aldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 105WE0603.
Temporal Representation: Data for this line of evidence were collected between 2011-08-03 and 2011-08-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 121382
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Fish fillet
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Rivers and Streams data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and the results are as follows 0 of the 1 samples exceeded the water quality standard for Aldrin. Data were collected for 1 fish species (1 composite(s) of Rainbow Trout each composed of 5 fish per composite).
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Sportfish Rivers and Streams .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: There shall be no bioaccumulation of pesticide concentrations found in bottom sediments or aquatic life. (Water Quality Control Plan for the North Coast Region)
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: National Academy of Science guidelines (NAS 1972) establish a maximum Aldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference: National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
 
Spatial Representation: Data was collected from 1 station(s) with the station code(s): 105WE0603.
Temporal Representation: Data for this line of evidence were collected between 2011-08-03 and 2011-08-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104000
 
Pollutant: Aldrin
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldrin.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L . This established criteria was divided by 2 in order to better represent a CMC value as specified in footnote g of Table (b)(1) of the California Toxics Rule, 2000.
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-04-30 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 40900
 
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, Middle HA and Lower HA, Scott River to Trinity River 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, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 101147, Aldrin
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103999
 
Pollutant: Aldrin
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aldrin.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L . This established criteria was divided by 2 in order to better represent a CMC value as specified in footnote g of Table (b)(1) of the California Toxics Rule, 2000.
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-04-24 and 2013-04-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
103977
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Alkalinity as CaCO3
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status.
Eight line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
This conclusion is based on the staff findings that:
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: 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 103977, Alkalinity as CaCO3
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 110498
 
Pollutant: Alkalinity as CaCO3
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105FS0416)
Temporal Representation: The samples were collected between the dates of 2013-09-24 and 2013-09-24
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103977, Alkalinity as CaCO3
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 114455
 
Pollutant: Alkalinity as CaCO3
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105BVCAGC)
Temporal Representation: The samples were collected between the dates of 2010-09-21 and 2010-09-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103977, Alkalinity as CaCO3
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 109093
 
Pollutant: Alkalinity as CaCO3
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0193)
Temporal Representation: The samples were collected between the dates of 2012-08-29 and 2012-08-29
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103977, Alkalinity as CaCO3
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 106745
 
Pollutant: Alkalinity as CaCO3
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Reference Condition Management Plan data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0097)
Temporal Representation: The samples were collected between the dates of 2014-07-22 and 2014-07-22
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103977, Alkalinity as CaCO3
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 118891
 
Pollutant: Alkalinity as CaCO3
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: Water Board staff assessed SWAMP Perennial Stream Surveys data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105PS0267)
Temporal Representation: The samples were collected between the dates of 2014-07-21 and 2014-07-21
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103977, Alkalinity as CaCO3
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104003
 
Pollutant: Alkalinity as CaCO3
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103977, Alkalinity as CaCO3
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104001
 
Pollutant: Alkalinity as CaCO3
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103977, Alkalinity as CaCO3
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104002
 
Pollutant: Alkalinity as CaCO3
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
75295
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Aluminum
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Sixteen lines of evidence are available in the administrative record to assess this pollutant. Two additional LOEs are available (LOEs 47480 and 25360) however these data re-evaluated in LOEs 122921, 122922, and 122928. Two of 51 samples exceed the objective for the protection of MUN.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Two of 51 samples exceed the objective for the protection of MUN and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104011
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104012
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104010
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113830
 
Pollutant: Aluminum
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105IN2529)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113837
 
Pollutant: Aluminum
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105SI0473)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113831
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105IN4395)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113836
 
Pollutant: Aluminum
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105LG0421)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113829
 
Pollutant: Aluminum
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105IN1545)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 25360
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 31
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 31 aluminum samples collected from the mainstem 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).
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): The Maximum Contaminant Level for aluminum is 1.0 mg/l (1,000 ug/L).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken as grab samples in well-mixed flows in glides or riffles from 3 sampling locations in the mainstem Klamath River, as follows: (1) at Seiad Valley (SWAMP Station ID 105KLAMSI), (2) at Orleans (SWAMP Station ID 105KLAMOR), and (3) at Weitchpec above the confluence with the Trinity River (SWAMPT Station ID 105KLAMWP).
Temporal Representation: At the Seiad Valley site, samples were collected over 16 site visits from March 2001 to June 2005. At the Orleans site, samples were collected over 5 site visits from October 2002 to June 2003. At the Weitchpec site, samples were collected over 18 visits from March 2002 to June 2003. The site visits corresponded to fall, winter, spring and early summer 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 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 47480
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
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 aluminum samples collected from the mainstem 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 replaces LOE 25360 from the 2010 Integrated Report cycle. The original LOE was replaced in order to update the objective to utilize the secondary MCL.
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: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken as grab samples in well-mixed flows in glides or riffles from 3 sampling locations in the mainstem Klamath River, as follows: (1) at Seiad Valley (SWAMP Station ID 105KLAMSI), (2) at Orleans (SWAMP Station ID 105KLAMOR), and (3) at Weitchpec above the confluence with the Trinity River (SWAMPT Station ID 105KLAMWP).
Temporal Representation: At the Seiad Valley site, samples were collected over 16 site visits from March 2001 to June 2005. At the Orleans site, samples were collected over 5 site visits from October 2002 to June 2003. At the Weitchpec site, samples were collected over 18 visits from March 2002 to June 2003. The site visits corresponded to fall, winter, spring and early summer 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 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113834
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113832
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 104013
 
Pollutant: Aluminum
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105EI0066)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 41358
 
Pollutant: Aluminum
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, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 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, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 122928
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 15
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 1 of 15 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21507 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KL2057]
Temporal Representation: Data was collected over the time period 2/25/2002-6/21/2005.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 122922
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 11
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 1 of 11 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21507 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Seiad Valley - 105KL6175]
Temporal Representation: Data was collected over the time period 2/27/2002-6/21/2005.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113835
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Aluminum.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 75295, Aluminum
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 122921
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Aluminum, Total. This LOE re-assesses data from LOE 21507 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The 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) for the North Coast Region
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Orleans - 105KL2802]
Temporal Representation: Data was collected over the time period 10/16/2002-6/11/2003.
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
103644
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Ametryn
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status.

Three lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 103644, Ametryn
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113838
 
Pollutant: Ametryn
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Ametryn.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103644, Ametryn
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113840
 
Pollutant: Ametryn
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Ametryn.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 103644, Ametryn
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 113839
 
Pollutant: Ametryn
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Ametryn.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L
Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
104111
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Aminomethyl Phosphonic Acid (AMPA)
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status.

Six line(s) of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. None samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 104111, Aminomethyl Phosphonic Acid (AMPA)
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103394
 
Pollutant: Aminomethyl Phosphonic Acid (AMPA)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for AMPA.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 104111, Aminomethyl Phosphonic Acid (AMPA)
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103396
 
Pollutant: Aminomethyl Phosphonic Acid (AMPA)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for AMPA.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 104111, Aminomethyl Phosphonic Acid (AMPA)
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103391
 
Pollutant: Aminomethyl Phosphonic Acid (AMPA)
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for AMPA.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 104111, Aminomethyl Phosphonic Acid (AMPA)
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103393
 
Pollutant: Aminomethyl Phosphonic Acid (AMPA)
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for AMPA.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 104111, Aminomethyl Phosphonic Acid (AMPA)
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103395
 
Pollutant: Aminomethyl Phosphonic Acid (AMPA)
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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for AMPA.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 104111, Aminomethyl Phosphonic Acid (AMPA)
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 103392
 
Pollutant: Aminomethyl Phosphonic Acid (AMPA)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm 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 RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for AMPA.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline: The evaluation guideline for AMPA is the USEPA Aquatic Life Benchmark of 249500 ug/L for a fish (acute).
Guideline Reference: OPP Aquatic Life Benchmarks
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
 
DECISION ID
100716
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
Pollutant: Arsenic
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.
Thirty-seven lines of evidence are available in the administrative record to assess this pollutant. Zero of 21 samples exceed the objective for protection of the WARM and COLD beneficial uses. Zero of 50 samples from the mainstem Klamath River exceed the objective for protection of the MUN beneficial use.
Per the Listing Policy, samples must be temporally independent and states as follows: "If the majority of samples were collected on a single day or during a single short-term natural event (e.g., a storm, flood, or wildfire), the data shall not be used as the primary data set supporting the listing decision." Additionally, the Listing Policy states: "In general, samples should be available from two or more seasons or from two or more events when effects or water quality objective exceedances would be expected to be clearly manifested." Therefore, although 2 of 3 samples from Indian Creek exceed the objective for the protection of MUN, the samples were all collected on a single day and therefore cannot be utilized as the primary data for a listing determination. Further data collection is necessary to determine if listing is warranted.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of 21 samples exceed the objective for protection of the WARM and COLD beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Zero of 50 samples from the mainstem Klamath River exceed the objective for protection of the MUN beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
 
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117032
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105EI0066)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117042
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105IN4395)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117035
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105IN1545)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117048
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2814)
Temporal Representation: The samples were collected between the dates of 2013-02-27 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117051
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL6111)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-11-19
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 122931
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 15
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 15 samples exceed the criterion for Arsenic, Total. This LOE re-assesses data from LOE 21507 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KL2057]
Temporal Representation: Data was collected over the time period 2/25/2002-6/21/2005.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117044
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105KL2057)
Temporal Representation: The samples were collected between the dates of 2013-03-05 and 2013-12-03
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 122929
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 5
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: State Water Board staff re-assessed SWAMP data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Arsenic, Total. This LOE re-assesses data from LOE 21507 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Orleans - 105KL2802]
Temporal Representation: Data was collected over the time period 10/16/2002-6/11/2003.
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 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 122930
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
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: State Water Board staff re-assessed SWAMP data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for Arsenic, Total. This LOE re-assesses data from LOE 21507 from the 2010 Integrated Report. Data were re-assessed in order to (1) update the numeric objective, and (2) evaluate these data in their own LOE, instead of being evaluated in the same LOE as other metals data.
Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2011): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
Objective/Criterion Reference: Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Seiad Valley - 105KL6175]
Temporal Representation: Data was collected over the time period 2/27/2002-6/21/2005.
Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 41424
 
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, Middle HA and Lower HA, Scott River to Trinity River 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 Title 22
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River was collected at 1 monitoring site [ Klamath River at Weitchpec - 105KLAMWP]
Temporal Representation: Data was collected over the time period 11/14/2007-7/15/2008.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The SWAMP QAPP (2008) was followed.
QAPP Information Reference(s): Surface Water Ambient Monitoring Program Quality Assurance Program Plan
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117041
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105IN4395)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117034
 
Pollutant: Arsenic
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: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105IN1545)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117038
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 1
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
 
SWAMP Data: SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s) (105IN2529)
Temporal Representation: The samples were collected between the dates of 2010-10-13 and 2010-10-13
Environmental Conditions:
QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
 
Line of Evidence (LOE) for Decision ID 100716, Arsenic
Region 1     
Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
 
LOE ID: 117057
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply