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

Supporting Information

Regional Board 5 - Central Valley Region

Water Body Name: Kentucky Creek (Nevada County)
Water Body ID: CAR5173101320110209100523
Water Body Type: River & Stream
 
DECISION ID
123435
Region 5     
Kentucky Creek (Nevada County)
 
Pollutant: Oxygen, Dissolved
Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Sources: A Source Unknown
Expected TMDL Completion Date: 2027
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Five lines of evidence are available in the administrative record to assess this pollutant. 31 of the 134 samples exceed the objective for Cold Freshwater Habitat. 21 of the 98 samples exceed the objective for Fish Spawning.

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. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. 31 of the 134 samples exceed the objective for Cold Freshwater Habitat. 21 of the 98 samples exceed the objective for Fish Spawning. These exceed the allowable frequency listed in Table 4.2 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that 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 123435, Oxygen, Dissolved
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 207818
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 24
Number of Exceedances: 14
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 14 of 24 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-08-14
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123435, Oxygen, Dissolved
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 207812
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 24
Number of Exceedances: 14
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 14 of 24 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-08-14
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123435, Oxygen, Dissolved
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 207811
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Fish Spawning
 
Number of Samples: 74
Number of Exceedances: 7
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 7 of 74 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-09-13 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123435, Oxygen, Dissolved
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 207819
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 74
Number of Exceedances: 7
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 7 of 74 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-09-13 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123435, Oxygen, Dissolved
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 59375
 
Pollutant: Oxygen, Dissolved
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 36
Number of Exceedances: 10
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Ten of the 36 daily averaged samples exceeded the water quality objective for dissolved oxygen in this water body.
Data Reference: Data for Various Pollutants at Placer County Utilities, 2005-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: From the Basin Plan, the minimum level for dissolved oxygen is 7 mg/L for waters designated as COLD.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at sites 45 - Kentucky Ck and 46 - Lwr Kentcky Ck.
Temporal Representation: Samples collected between 8/10/2005 and 8/7/2010.
Environmental Conditions:
QAPP Information: CITIZEN WATER MONITORING QUALITY ASSURANCE PROJECT PLAN FOR THE YUBA WATERSHED MONITORING COMMITTEE (June 30, 2008)
QAPP Information Reference(s):
 
 
DECISION ID
123436
Region 5     
Kentucky Creek (Nevada County)
 
Pollutant: pH
Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Sources: A Source Unknown
Expected TMDL Completion Date: 2027
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Nine lines of evidence are available in the administrative record to assess this pollutant. 3 of the 80 samples exceeded the OBJECTIVE for REC-1, REC-2, and SHELL. 25 of the 123 samples exceeded the OBJECTIVE for COLD.

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. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. 3 of the 80 samples exceeded the OBJECTIVE for REC-1, REC-2, and SHELL. 25 of the 123 samples exceeded the OBJECTIVE for COLD, and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
 
Regional Board Decision Recommendation: This decision was made by SWRCB staff.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 229686
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Shellfish Harvesting
 
Number of Samples: 62
Number of Exceedances: 2
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 2 of 62 samples exceeded the water quality threshold for pH.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-11-06 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 228905
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 18
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality threshold for pH.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-06-08
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 228597
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 18
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality threshold for pH.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-06-08
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 65306
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 43
Number of Exceedances: 22
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: 22 of the 43 averaged monthly samples exceeded the water quality objective for pH in this water body.
Data Reference: Data in Yuba: metal, 2000-2007 and conventional, 2000-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: From the Basin Plan, pH levels should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at sites 45 - Kentucky Ck and 46 - Lwr Kentcky Ck.
Temporal Representation: Samples collected between October of 2005 and August, 2010.
Environmental Conditions:
QAPP Information: CITIZEN WATER MONITORING QUALITY ASSURANCE PROJECT PLAN FOR THE YUBA WATERSHED MONITORING COMMITTEE (June 30, 2008)
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 228505
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 62
Number of Exceedances: 2
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 2 of 62 samples exceeded the water quality threshold for pH.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-11-06 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 229154
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Non-Contact Recreation
 
Number of Samples: 62
Number of Exceedances: 2
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 2 of 62 samples exceeded the water quality threshold for pH.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-11-06 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 229546
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 62
Number of Exceedances: 2
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 2 of 62 samples exceeded the water quality threshold for pH.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-11-06 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 229152
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Shellfish Harvesting
 
Number of Samples: 18
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality threshold for pH.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-06-08
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123436, pH
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 229155
 
Pollutant: pH
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Non-Contact Recreation
 
Number of Samples: 18
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 1 of 18 samples exceeded the water quality threshold for pH.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-06-08
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
 
DECISION ID
128311
Region 5     
Kentucky Creek (Nevada County)
 
Pollutant: Specific Conductivity
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

Three lines of evidence are available in the administrative record to assess this pollutant. Zero of the 138 samples, reported as a total concentration or with the fraction not reported, exceeded the water quality objective for MUN.

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

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Zero of the 138 samples, reported as a total concentration or with the fraction not reported, exceeded the water quality objective for MUN, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: This decision was made by SWRCB staff.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards for the pollutant are not exceeded.
 
 
Line of Evidence (LOE) for Decision ID 128311, Specific Conductivity
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 59374
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 41
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: None of the 41 daily averaged samples exceeded the water quality objective for electrical conductivity in this water body.
Data Reference: Data for Various Pollutants at Placer County Utilities, 2005-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The secondary MCLs for electrical conductivity provide a range of values including a recommended level (900 uS/cm), upper level (1600 uS/cm) and a short-term level (2200 uS/cm). The 'recommended' level of 900 uS/cm was used as it is intended to be protective of all drinking water uses.
Objective/Criterion Reference: Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449.
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples collected at sites 45 - Kentucky Ck and 46 - Lwr Kentcky Ck.
Temporal Representation: Samples collected between 8/10/2005 and 8/7/2010.
Environmental Conditions:
QAPP Information: CITIZEN WATER MONITORING QUALITY ASSURANCE PROJECT PLAN FOR THE YUBA WATERSHED MONITORING COMMITTEE (June 30, 2008)
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 128311, Specific Conductivity
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 229922
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 73
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 0 of 73 samples exceeded the water quality threshold for SpecificConductivity.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Secondary MCL that is incorporated by reference in the Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin for specific conductance is 900 uS/cm.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-09-13 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 128311, Specific Conductivity
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 229847
 
Pollutant: Specific Conductivity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 24
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 0 of 24 samples exceeded the water quality threshold for SpecificConductivity.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Secondary MCL that is incorporated by reference in the Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin for specific conductance is 900 uS/cm.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-08-14
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
 
DECISION ID
123437
Region 5     
Kentucky Creek (Nevada County)
 
Pollutant: Temperature, water
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status Revised
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

Seven lines of evidence are available in the administrative record to assess this pollutant. Seven of the 145 samples exceeded the OBJECTIVE for COLD. Six of the 94 samples exceeded the OBJECTIVE for Fish Migration and Fish Spawning.

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. Seven of the 145 samples exceeded the OBJECTIVE for COLD. Six of the 94 samples exceeded the OBJECTIVE for Fish Migration and Fish Spawning, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: This decision was made by SWRCB staff.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards for the pollutant are not exceeded.
 
 
Line of Evidence (LOE) for Decision ID 123437, Temperature, water
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 230444
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Fish Migration
 
Number of Samples: 74
Number of Exceedances: 5
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 5 of 74 samples exceeded the water quality threshold for Temperature.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: 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 (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline: Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference: Inland Fishes of California
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-09-13 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123437, Temperature, water
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 230247
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Fish Migration
 
Number of Samples: 20
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 1 of 20 samples exceeded the water quality threshold for Temperature.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: 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 (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline: Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference: Inland Fishes of California
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-08-14
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123437, Temperature, water
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 230230
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 74
Number of Exceedances: 5
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 5 of 74 samples exceeded the water quality threshold for Temperature.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: 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 (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline: Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference: Inland Fishes of California
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-09-13 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123437, Temperature, water
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 230244
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Fish Spawning
 
Number of Samples: 20
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 1 of 20 samples exceeded the water quality threshold for Temperature.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: 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 (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline: Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference: Inland Fishes of California
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-08-14
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123437, Temperature, water
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 230245
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Fish Spawning
 
Number of Samples: 74
Number of Exceedances: 5
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 5 of 74 samples exceeded the water quality threshold for Temperature.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: 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 (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline: Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference: Inland Fishes of California
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 46)
Temporal Representation: The samples were collected between the dates of 2010-09-13 and 2018-11-10
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123437, Temperature, water
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 230763
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 20
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Water Board staff assessed SYRCL River Monitoring Program data for Kentucky Creek (Nevada County) to determine beneficial use support and results are as follows: 1 of 20 samples exceeded the water quality threshold for Temperature.
Data Reference: Field data for the 2020/2022 integrated report in Region 5.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: 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 (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
 
Evaluation Guideline: Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference: Inland Fishes of California
 
Spatial Representation: The samples were collected at 1 monitoring site (SYRCL 45)
Temporal Representation: The samples were collected between the dates of 2010-09-11 and 2013-08-14
Environmental Conditions:
QAPP Information: Ronning, K. 2019. Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee.
QAPP Information Reference(s): Citizen Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Monitoring Committee
 
Line of Evidence (LOE) for Decision ID 123437, Temperature, water
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 65320
 
Pollutant: Temperature, water
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 51
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of the 51 samples exceeded the evaluation guideline for temperature in this water body (SYRCL, 2010).
Data Reference: Data in Yuba: metal, 2000-2007 and conventional, 2000-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: 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. In determining compliance with the water quality objectives for temperature, appropriate averaging periods may be applied provided that beneficial uses will be fully protected (Central Valley Regional Board Basin Plan, Pg. III-8.00, Water Quality Objectives).
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The lethal temperature threshold for Steelhead adult migration and holding and juvenile growth and rearing is 24 degrees Celsius. (Carter, 2008).
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: Samples were collected at the following locations: SYRCL monitoring station 45, Kentucky Ck SYRCL monitoring station 46, Lwr Kentcky Ck
Temporal Representation: Samples were collected monthly from 8/10/2005 to 8/9/2010.
Environmental Conditions:
QAPP Information: CITIZEN WATER MONITORING QUALITY ASSURANCE PROJECT PLAN FOR THE YUBA WATERSHED MONITORING COMMITTEE (June 30, 2008)
QAPP Information Reference(s):
 
 
DECISION ID
100319
Region 5     
Kentucky Creek (Nevada County)
 
Pollutant: Indicator Bacteria
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the three samples exceed the evaluation guideline.


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

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 the three samples exceed the evaluation guideline and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 26 samples are needed to determine if a beneficial use is fully supported using table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
 
State Board Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: 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 100319, Indicator Bacteria
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 65303
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the three samples exceeded the E. coli objective.
Data Reference: Data in Yuba: metal, 2000-2007 and conventional, 2000-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: The E. coli concentration shall not exceed more than 235/100 ml. USEPA. Ambient Water Quality Criteria for Bacteria - 1986.
Guideline Reference: Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
 
Spatial Representation: The samples were collected at SYRCL monitoring station 45 Kentucky Creek and station 46, Lower Kentucky Creek. WBID: CAR5173101320110209100523
Temporal Representation: The samples were collected monthly between 2005 and 2007.
Environmental Conditions:
QAPP Information: This data was collected under the Water Monitoring Quality Assurance Project Plan for the Yuba Watershed Council Monitoring Committee. Rev 1.3. qa12
QAPP Information Reference(s):
 
 
DECISION ID
67924
Region 5     
Kentucky Creek (Nevada County)
 
Pollutant: Nitrate
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
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 3.1a one line(s) of evidence are necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. Zero of the two samples exceed the Criteria/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. Zero of two samples exceeded Criteria/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 67924, Nitrate
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 65305
 
Pollutant: Nitrate
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: None of the two samples exceeded the water quality objective for nitrate. The sample was reported as nitrate as nitrogen and converted before compared with the objective.
Data Reference: Data in Yuba: metal, 2000-2007 and conventional, 2000-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: At a minimum, water designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The MCL for nitrate (as NO3) is 45 mg/L.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at SYRCL monitoring station 45 - Kentucky Creek.
Temporal Representation: Samples were collected on November 13, 2006 and August 8, 2007.
Environmental Conditions:
QAPP Information: This data was collected under the Water Monitoring Quality Assurance Project Plan for the Yuba Watershed Council Monitoring Committee. qa12
QAPP Information Reference(s):
 
 
DECISION ID
67915
Region 5     
Kentucky Creek (Nevada County)
 
Pollutant: Iron
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Sources: A Source Unknown
Expected TMDL Completion Date: 2027
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status.

One lines of evidence are available in the administrative record to assess this pollutant. Two of two samples exceeds the recommended criteria for protection of aquatic life (COLD).

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

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Two of two samples exceed the recommended criteria and this exceeds the allowable frequency of table 3.1.
4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are 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 following changes to the decision:
The water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 67915, Iron
Region 5     
Kentucky Creek (Nevada County)
 
LOE ID: 65304
 
Pollutant: Iron
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 2
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Both samples exceeded the evaluation guideline of 1,000 ug/L.
Data Reference: Data in Yuba: metal, 2000-2007 and conventional, 2000-2010.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
 
Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations are intended protect freshwater aquatic organisms from chronic exposures and are expressed as 4-day average concentrations. The evaluation guideline for Iron is 1,000 ug/L.
Guideline Reference: National recommended water quality criteria: 2002. EPA-822-R-02-047 Washington, D.C. USEPA
 
Spatial Representation: The samples were collected from station 45 Kentucky Creek (Nevada County).
Temporal Representation: The samples were collected from 10/6/2005 and 11/13/2006.
Environmental Conditions:
QAPP Information: Samples were collected and analyzed in accordance with Water Monitoring Quality Assurance Project Plan prepared for the Yuba Watershed Monitoring Committee (Revision 1.3) dated June 30, 2008.
QAPP Information Reference(s):