Draft 2008 California 303(d)/305(b) Integrated Report

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name: Sweetwater Reservoir
Water Body ID: CAL9092100019991117112141
Water Body Type: Lake & Reservoir
 
DECISION ID
4945
 
Pollutant: 1,1,1-Trichloroethane
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 70 samples exceeded the Basin Plan objective for 1,1,1-Trichloroethane.

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. None of the 70 samples exceeded the California Toxics Rule objective for 1,1,1-Trichloroethane, 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.
 
RWQCB Board Decision / Staff 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.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4945
 
LOE ID: 1232
 
Pollutant: 1,1,1-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,1-Trichloroethane is 0.200 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected twice per day on one day, every other month for a year from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1235
 
Pollutant: 1,1,1-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,1-Trichloroethane is 0.200 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected twice per day on one day every other month for 10 months from 09/10/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1234
 
Pollutant: 1,1,1-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,1-Trichloroethane is 0.200 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 2 times per day on one day every other month for a year from 09/09/1998 to 09/20/1998.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1237
 
Pollutant: 1,1,1-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples was in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,1-Trichloroethane is 0.200 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/10/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1239
 
Pollutant: 1,1,1-Trichloroethane
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,1-Trichloroethane is 0.200 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1233
 
Pollutant: 1,1,1-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,1-Trichloroethane is 0.200 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day, one day every other month for 10 months from 09/20/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS
QAPP Information Reference(s):

 
LOE ID: 1236
 
Pollutant: 1,1,1-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,1-Trichloroethane is 0.200 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month for 10 months from 09/20/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1238
 
Pollutant: 1,1,1-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,1-Trichloroethane is 0.200 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cover Pond.
Temporal Representation: Samples were collected 1-2 times on one day every other month from 09/10/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5080
 
Pollutant: 1,1,2,2-Tetrachloroethane
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 70 samples exceeded the Basin Plan criteria, and these do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff 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.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5080
 
LOE ID: 1311
 
Pollutant: 1,1,2,2-Tetrachloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2,2-Tetrachloroethane is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1312
 
Pollutant: 1,1,2,2-Tetrachloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2,2-Tetrachloroethane is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1313
 
Pollutant: 1,1,2,2-Tetrachloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2,2-Tetrachloroethane is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1314
 
Pollutant: 1,1,2,2-Tetrachloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2,2-Tetrachloroethane is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1315
 
Pollutant: 1,1,2,2-Tetrachloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2,2-Tetrachloroethane is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1316
 
Pollutant: 1,1,2,2-Tetrachloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2,2-Tetrachloroethane is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1317
 
Pollutant: 1,1,2,2-Tetrachloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2,2-Tetrachloroethane is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1318
 
Pollutant: 1,1,2,2-Tetrachloroethane
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2,2-Tetrachloroethane is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
4961
 
Pollutant: 1,1,2-Trichloroethane
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 70 samples exceeded the Basin Plan criteria (all were 'non-detects'), and these do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4961
 
LOE ID: 1244
 
Pollutant: 1,1,2-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2-Trichloroethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day, one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1245
 
Pollutant: 1,1,2-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2-Trichloroethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end of the reservoir fill boundary.
Temporal Representation: Samples were collected once per day, one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study
QAPP Information Reference(s):

 
LOE ID: 1243
 
Pollutant: 1,1,2-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2-Trichloroethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day, one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1242
 
Pollutant: 1,1,2-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2-Trichloroethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day, one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1241
 
Pollutant: 1,1,2-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2-Trichloroethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day, one day every other month from 09/10/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1240
 
Pollutant: 1,1,2-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2-Trichloroethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day every other month from 09/1998 to 09/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1246
 
Pollutant: 1,1,2-Trichloroethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2-Trichloroethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day, one day every other month from 09/10/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1247
 
Pollutant: 1,1,2-Trichloroethane
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1,2-Trichloroethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
4962
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 70 samples exceeded the Basin Plan criteria (all were 'non-detects'), and these do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4962
 
LOE ID: 1255
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
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: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1- Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1249
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1- Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day, on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1250
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1- Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day, on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1252
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1- Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day, on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1253
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1- Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day, on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1251
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1- Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day, on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1248
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1- Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day, on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1254
 
Pollutant: 1,1-Dichloroethylene (DCE)/ Vinyldine Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,1- Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day, on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5035
 
Pollutant: 1,2,4-Trichlorobenzene
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 70 samples exceeded the Basin Plan criteria (all were 'non-detects'), and these do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5035
 
LOE ID: 1271
 
Pollutant: 1,2,4-Trichlorobenzene
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2,4-Trichlorobenzene is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1270
 
Pollutant: 1,2,4-Trichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2,4-Trichlorobenzene is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1264
 
Pollutant: 1,2,4-Trichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2,4-Trichlorobenzene is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1269
 
Pollutant: 1,2,4-Trichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2,4-Trichlorobenzene is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1268
 
Pollutant: 1,2,4-Trichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2,4-Trichlorobenzene is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1267
 
Pollutant: 1,2,4-Trichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2,4-Trichlorobenzene is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1266
 
Pollutant: 1,2,4-Trichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2,4-Trichlorobenzene is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1265
 
Pollutant: 1,2,4-Trichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2,4-Trichlorobenzene is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5160
 
Pollutant: 1,2-Dichloroethane
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: One line of evidence is available in the administrative record to assess this pollutant. None of the 4 samples exceed the Basin Plan criteria, and this does not exceed the allowable frequency of the Listing Policy.

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.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5160
 
LOE ID: 1466
 
Pollutant: 1,2-Dichloroethane
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003), (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2-Dichloroethane is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5034
 
Pollutant: 1,2-Dichloroethylene,-trans
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 70 samples exceeded the Basin Plan criteria (all were 'non-detects'), and these do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5034
 
LOE ID: 1262
 
Pollutant: 1,2-Dichloroethylene,-trans
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for trans-1,2- Dichloroethylene is 0.01 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1998.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1261
 
Pollutant: 1,2-Dichloroethylene,-trans
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for trans-1,2- Dichloroethylene is 0.01 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1998.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1258
 
Pollutant: 1,2-Dichloroethylene,-trans
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for trans-1,2- Dichloroethylene is 0.01 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1998.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1263
 
Pollutant: 1,2-Dichloroethylene,-trans
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB 9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for trans-1,2- Dichloroethylene is 0.01 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1260
 
Pollutant: 1,2-Dichloroethylene,-trans
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 0971999. None of the 8 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for trans-1,2- Dichloroethylene is 0.01 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1998.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1257
 
Pollutant: 1,2-Dichloroethylene,-trans
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for trans-1,2- Dichloroethylene is 0.01 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1998.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1256
 
Pollutant: 1,2-Dichloroethylene,-trans
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for trans-1,2- Dichloroethylene is 0.01 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1998.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1259
 
Pollutant: 1,2-Dichloroethylene,-trans
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance. All samples were below the detection limit (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for trans-1,2- Dichloroethylene is 0.01 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at the Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1998.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5161
 
Pollutant: 1,2-Dichloropropane
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: One line of evidence is available in the administrative record to assess this pollutant. None of the 4 samples exceed the Basin Plan criteria, and this does not exceed the allowable frequency of the Listing Policy.

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.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5161
 
LOE ID: 1467
 
Pollutant: 1,2-Dichloropropane
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (USGS, 2002), (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for 1,2-Dichloropropane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5057
 
Pollutant: Alachlor
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 82 samples exceeded the Basin Plan criteria, and these do not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5057
 
LOE ID: 1398
 
Pollutant: Alachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 16
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 01/2001. None of the 16 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Alachlor is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 01/2001. Samples were collected in 07/1997, 11/1997, on a quarterly basis from 1998-2000, and in 01/2001. Samples were collected once per sampling day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1395
 
Pollutant: Alachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Alachlor is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1394
 
Pollutant: Alachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Alachlor is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1393
 
Pollutant: Alachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Alachlor is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1391
 
Pollutant: Alachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Alachlor is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1396
 
Pollutant: Alachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Alachlor is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1397
 
Pollutant: Alachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Alachlor is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1392
 
Pollutant: Alachlor
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Alachlor is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5105
 
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: One line of evidence is available in the administrative record to assess this pollutant. One of the 4 samples exceed the Basin Plan criteria, and this does not exceed the allowable frequency of the Listing Policy.

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.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5105
 
LOE ID: 1445
 
Pollutant: Aluminum
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 1
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 on 4 days from 12/1997 to 02/24/2000. One of 4 samples was in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Aluminum is 0.2 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. No exact location was given.
Temporal Representation: Samples were collected 4 times from 12/1997 to 02/2000. One sample was collected each year.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5106
 
Pollutant: Antimony
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: One line of evidence is available in the administrative record to assess this pollutant. None of the 5 samples exceed the Basin Plan criteria, and this does not exceed the allowable frequency of the Listing Policy.

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.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5106
 
LOE ID: 1446
 
Pollutant: Antimony
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 5 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Antimony is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. The exact location was not reported.
Temporal Representation: Five samples were collected from 02/1998 to 02/2000. Samples were collected in 02/1998, 08/1998, 02/1999, 07/1999, and 02/2000. One sample was collected per sampling day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5107
 
Pollutant: Arsenic
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 6 samples exceed the Basin Plan water quality objective for arsenic.

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. None of the 6 samples exceed the Basin Plan water quality objective for arsenic 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5107
 
LOE ID: 1447
 
Pollutant: Arsenic
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 6
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 6 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Arsenic is 0.05 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: One sample per day was collected on 6 days from 02/1998 to 02/2000. Samples were collected in 02/1998, 05/1998, 08/1998, 02/1999, 07/1999, and 02/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5058
 
Pollutant: Atrazine
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 82 samples exceed the Basin Plan water quality objective for atrazine.

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. None of the 82 samples exceed the Basin Plan water quality objective for atrazine 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5058
 
LOE ID: 1403
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Atrazine is 0.003 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1402
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Atrazine is 0.003 mg/
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1406
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 16
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 01/2001. None of the 16 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Atrazine is 0.003 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 01/2001. Samples were collected in 07/1997, 11/1997, on a quarterly basis from 1998-2000, and in 01/2001. Samples were collected once per sampling day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1401
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Atrazine is 0.003 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1400
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Atrazine is 0.003 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1404
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Atrazine is 0.003 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1405
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Atrazine is 0.003 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1399
 
Pollutant: Atrazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Atrazine is 0.003 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5108
 
Pollutant: Barium
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the four samples exceed the Basin Plan water quality objective for Barium.

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. None of the four samples exceed the Basin Plan water quality objective for Barium 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5108
 
LOE ID: 1448
 
Pollutant: Barium
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from12/1997 to 02/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Barium is 1.0 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 4 days from12/1997 to 02/2000. Samples were also collected in 06/1998 and 07/1999.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
4991
 
Pollutant: Benzene
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for benzene. All samples were 'non-detects'.

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. None of the 70 samples exceed the Basin Plan water quality objective for benzene. All samples were 'non-detects'. 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4991
 
LOE ID: 1294
 
Pollutant: Benzene
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Benzene is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1287
 
Pollutant: Benzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Benzene is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1288
 
Pollutant: Benzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Benzene is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1289
 
Pollutant: Benzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Benzene is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1290
 
Pollutant: Benzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Benzene is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1291
 
Pollutant: Benzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Benzene is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1292
 
Pollutant: Benzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Benzene is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1293
 
Pollutant: Benzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Benzene is 0.001 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5109
 
Pollutant: Beryllium
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 5 samples exceed the Basin Plan water quality objective for beryllium.

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. None of the 5 samples exceed the Basin Plan water quality objective for beryllium 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5109
 
LOE ID: 1449
 
Pollutant: Beryllium
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 5 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Beryllium is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not recorded.
Temporal Representation: Samples were collected once per day on 5 days from 02/1998 to 02/2000. Samples were also collected in 08/1998, 02/1999, and 07/1999.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5134
 
Pollutant: Cadmium
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 5 samples exceed the Basin Plan water quality objective for cadmium.

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. None of the 5 samples exceed the Basin Plan water quality objective for cadmium 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5134
 
LOE ID: 1450
 
Pollutant: Cadmium
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: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 5 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cadmium is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 5 days form 02/1998 to 02/2000. Samples were also collected in 08/1998, 02/1999, 07/1999, and 02/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5059
 
Pollutant: Carbofuran
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Seven lines of evidence are available in the administrative record to assess this pollutant. None of the 65 samples exceed the Basin Plan water quality objective carbofuran.

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. None of the 65 samples exceed the Basin Plan water quality objective carbofuran 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5059
 
LOE ID: 1408
 
Pollutant: Carbofuran
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Carbofuran is 0.018 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1410
 
Pollutant: Carbofuran
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Carbofuran is 0.018 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1411
 
Pollutant: Carbofuran
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Carbofuran is 0.018 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1407
 
Pollutant: Carbofuran
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Carbofuran is 0.018 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1409
 
Pollutant: Carbofuran
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Carbofuran is 0.018 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1412
 
Pollutant: Carbofuran
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 6
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 6 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Carbofuran is 0.018 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study
QAPP Information Reference(s):

 
LOE ID: 1413
 
Pollutant: Carbofuran
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Carbofuran is 0.018 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5162
 
Pollutant: Carbon tetrachloride
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the four samples exceed the Basin Plan water quality objective for carbon tetrachloride.

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. None of the four samples exceed the Basin Plan water quality objective for carbon tetrachloride 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5162
 
LOE ID: 1468
 
Pollutant: Carbon tetrachloride
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Carbon tetrachloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5129
 
Pollutant: Chloride
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 8 samples exceed the Basin Plan water quality objective for chloride.

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. None of the 8 samples exceed the Basin Plan water quality objective for chloride 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5129
 
LOE ID: 1464
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 11/2000. None of the 8 samples were in exceedance (RWQCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for Chloride is 250 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 11/2000 once per day on 8 days during this time span. Samples were collected during the summer and winter months.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment. QA=?
QAPP Information Reference(s):
 
DECISION ID
5064
 
Pollutant: Chlorobenzene (mono)
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for chlorobenzene (mono).

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. None of the 70 samples exceed the Basin Plan water quality objective for chlorobenzene (mono) 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.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff 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.
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5064
 
LOE ID: 1299
 
Pollutant: Chlorobenzene (mono)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Chlorobenzene (mono) is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1298
 
Pollutant: Chlorobenzene (mono)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Chlorobenzene (mono) is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1296
 
Pollutant: Chlorobenzene (mono)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Chlorobenzene (mono) is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1297
 
Pollutant: Chlorobenzene (mono)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Chlorobenzene (mono) is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1295
 
Pollutant: Chlorobenzene (mono)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Chlorobenzene (mono) is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1300
 
Pollutant: Chlorobenzene (mono)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Chlorobenzene (mono) is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1301
 
Pollutant: Chlorobenzene (mono)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Chlorobenzene (mono) is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1302
 
Pollutant: Chlorobenzene (mono)
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Chlorobenzene (mono) is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5135
 
Pollutant: Chromium (total)
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the five samples exceed the water quality objective for chromium (total).

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. None of the five samples exceed the water quality objective for chromium (total) 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5135
 
LOE ID: 1451
 
Pollutant: Chromium (total)
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: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 5 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Total Chromium is 0.05 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 5 days from 02/1998 to 02/2000. Samples were also collected in 08/1998 , 02/1999, and 07/1999.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment. QA=?
QAPP Information Reference(s):
 
DECISION ID
5136
 
Pollutant: Copper
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 4 samples exceed the Basin Plan water quality objective for copper.

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. None of the 4 samples exceed the Basin Plan water quality objective for copper 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5136
 
LOE ID: 1452
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 12/1997 to 02/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Copper is 1.0 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 12/15/1997, 06/17/1997, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5046
 
Pollutant: Dichloromethane
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 69 samples exceed the Basin Plan water quality objective for dichloromethane.

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. None of the 69 samples exceed the Basin Plan water quality objective for dichloromethane 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5046
 
LOE ID: 1327
 
Pollutant: Dichloromethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Dichloromethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1334
 
Pollutant: Dichloromethane
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, and 10/2000. None of the 3 samples were in exceedance (RWQCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Dichloromethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1328
 
Pollutant: Dichloromethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Dichloromethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1329
 
Pollutant: Dichloromethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Dichloromethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1330
 
Pollutant: Dichloromethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Dichloromethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1331
 
Pollutant: Dichloromethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance.
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Dichloromethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1332
 
Pollutant: Dichloromethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Dichloromethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1333
 
Pollutant: Dichloromethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Dichloromethane is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5081
 
Pollutant: Ethylbenzene
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for ethylbenzene.

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. None of the 70 samples exceed the Basin Plan water quality objective for ethylbenzene 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5081
 
LOE ID: 1319
 
Pollutant: Ethylbenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Ethylbenzene is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1325
 
Pollutant: Ethylbenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Ethylbenzene is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1320
 
Pollutant: Ethylbenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Ethylbenzene is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1326
 
Pollutant: Ethylbenzene
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Ethylbenzene is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1321
 
Pollutant: Ethylbenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Ethylbenzene is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1322
 
Pollutant: Ethylbenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Ethylbenzene is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1323
 
Pollutant: Ethylbenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Ethylbenzene is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1324
 
Pollutant: Ethylbenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of 7 the samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Ethylbenzene is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5127
 
Pollutant: Fluoride
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 8 samples exceed the Basin Plan water quality objective for flouride.

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. None of the 8 samples exceed the Basin Plan water quality objective for flouride 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5127
 
LOE ID: 1463
 
Pollutant: Fluoride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 11/2000. None of the 8 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters and all beneficial uses, the WQO for Fluoride is 1.0 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 11/2000 once per day on 8 days in the time span. Samples were collected during winter and summer months.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5163
 
Pollutant: Glyphosate
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 13 samples exceed the Basin Plan water quality objective for glyphosate.

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. None of the 13 samples exceed the Basin Plan water quality objective for glyphosate 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5163
 
LOE ID: 1469
 
Pollutant: Glyphosate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 01/2001. None of the 13 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Glyphosate is 0.7 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 01/2001. One sample per month was collected in 07/1997, 11/1997,08/1998, 10/1998, and 01/2001. Samples were collected on a quarterly basis in 1999 and 2000. Samples were collected once per sampling day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5137
 
Pollutant: Iron
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. One of the 4 samples exceed the Basin Plan water quality objective for iron.

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. One of the 4 samples exceed the Basin Plan water quality objective for iron 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5137
 
LOE ID: 1453
 
Pollutant: Iron
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 12/1997 to 02/2000. One of 4 samples was in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Iron is 0.3 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 12/15/1997, 06/17/1998, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5060
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Seven lines of evidence are available in the administrative record to assess this pollutant. None of the 65 samples exceed the water quality objective for lindane/gamma hexachlorocyclohexane.

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. None of the 65 samples exceed the water quality objective for lindane/gamma hexachlorocyclohexane 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5060
 
LOE ID: 1420
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Lindane is 0.0002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1416
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Lindane is 0.0002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1417
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Lindane is 0.0002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1418
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Lindane is 0.0002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1419
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 6
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 6 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Lindane is 0.0002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1415
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Lindane is 0.0002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1414
 
Pollutant: Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Lindane is 0.0002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5138
 
Pollutant: Manganese
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. One of the four samples exceed the Basin Plan water quality objective for manganese.

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. One of the four samples exceed the Basin Plan water quality objective for manganese 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5138
 
LOE ID: 1454
 
Pollutant: Manganese
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 1
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 12/1997 to 02/2000. One of 4 samples was in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: The water quality objective for manganese in Sweetwater Reservoir is 0.05 milligrams/liter (mg/l) according to Basin Plan, Table 3-2 entitled, Water Quality Objectives. This concentration is not be exceeded more than 10% of the time during any one year period.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 12/15/1997, 06/17/1998, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5156
 
Pollutant: Mercury
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 5 samples exceed the Basin Plan water quality objective for Mercury.

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. None of the 5 samples exceed the Basin Plan water quality objective for Mercury 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5156
 
LOE ID: 1455
 
Pollutant: Mercury
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: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 5 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Mercury is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 02/25/1998, 08/04/1998, 02/09/1999, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5083
 
Pollutant: Molinate
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 81 samples exceed the Basin Plan water quality objective for molinate.

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. None of the 81 samples exceed the Basin Plan water quality objective for molinate 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5083
 
LOE ID: 1426
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 6
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 6 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Molinate is 0.02 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1425
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Molinate is 0.02 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1424
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Molinate is 0.02 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1423
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Molinate is 0.02 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1428
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 16
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 01/2001. None of the 16 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Molinate is 0.02 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 01/2001. Samples were collected in 07/1997, 11/1997, on a quarterly basis from 1998-2000, and in 01/2001. Samples were collected once per sampling day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1427
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Molinate is 0.02 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1422
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Molinate is 0.02 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 07/12/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1421
 
Pollutant: Molinate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Molinate is 0.02 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5157
 
Pollutant: Nickel
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the five samples exceed the Basin Plan water quality objective for nickel.

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. None of the five samples exceed the Basin Plan water quality objective for nickel 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5157
 
LOE ID: 1456
 
Pollutant: Nickel
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: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 5 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for nickel is 0.1 mg/L
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. The exact location was not reported.
Temporal Representation: Samples were collected once per day on 02/25/2998, 08/04/1998, 02/09/1999, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5158
 
Pollutant: Selenium
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 5 samples exceed the Basin Plan water quality objective for selenium.

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. None of the 5 samples exceed the Basin Plan water quality objective for selenium 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5158
 
LOE ID: 1457
 
Pollutant: Selenium
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: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 5 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Selenium is 0.05 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. The exact location was not reported.
Temporal Representation: Samples were collected once per day on 02/25/1998, 08/04/1998, 02/09/1999, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5159
 
Pollutant: Silver
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 4 samples exceed the Basin Plan water quality objective for silver.

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. None of the 4 samples exceed the Basin Plan water quality objective for silver 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5159
 
LOE ID: 1458
 
Pollutant: Silver
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 12/1997 to 02/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Silver is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 12/15/1997, 06/17/1998, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5084
 
Pollutant: Simazine
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 81 samples exceeded the Basin Plan water quality objective for simazine.

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. None of the 81 samples exceeded the Basin Plan water quality objective for simazine 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5084
 
LOE ID: 1429
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Simazine is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1434
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 6
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 6 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Simazine is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1433
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Simazine is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1432
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Simazine is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1436
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 16
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 01/2001. None of the 16 samples were in exceedance. Most samples except 2 were reported as non-detect. However, the 2 detectable samples were still below the WQO (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Simazine is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 01/2001. Samples were collected in 07/1997, 11/1997, on a quarterly basis from 1998-2000, and in 01/2001. Samples were collected once per sampling day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1430
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Simazine is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1431
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Simazine is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1435
 
Pollutant: Simazine
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Simazine is 0.004 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5115
 
Pollutant: Styrene
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceeded the Basin Plan water quality objective for styrene.

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. None of the 70 samples exceeded the Basin Plan water quality objective for styrene 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5115
 
LOE ID: 1358
 
Pollutant: Styrene
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Styrene is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1351
 
Pollutant: Styrene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Styrene is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1352
 
Pollutant: Styrene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Styrene is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1353
 
Pollutant: Styrene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Styrene is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1354
 
Pollutant: Styrene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Styrene is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1357
 
Pollutant: Styrene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Styrene is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1356
 
Pollutant: Styrene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Styrene is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1355
 
Pollutant: Styrene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Styrene is 0.1 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5089
 
Pollutant: Sulfates
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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. None of the 8 samples exceed the Basin Plan water quality objective for sulfates.

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. None of the 8 samples exceed the Basin Plan water quality objective for sulfates 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5089
 
LOE ID: 1465
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 11/2000. None of the 8 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Sulfate is 250 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 11/2000 once per day on 8 days during this time span. Samples were collected during the summer and winter months.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5116
 
Pollutant: Tetrachloroethylene/PCE
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceeded the Basin Plan water quality objective for tetrachloroethylene/PCE.

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. None of the 70 samples exceeded the Basin Plan water quality objective for tetrachloroethylene/PCE 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5116
 
LOE ID: 1359
 
Pollutant: Tetrachloroethylene/PCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Tetrachloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1361
 
Pollutant: Tetrachloroethylene/PCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Tetrachloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1362
 
Pollutant: Tetrachloroethylene/PCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Tetrachloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1363
 
Pollutant: Tetrachloroethylene/PCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Tetrachloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1360
 
Pollutant: Tetrachloroethylene/PCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Tetrachloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1364
 
Pollutant: Tetrachloroethylene/PCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Tetrachloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1366
 
Pollutant: Tetrachloroethylene/PCE
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Tetrachloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1365
 
Pollutant: Tetrachloroethylene/PCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Tetrachloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5005
 
Pollutant: Thallium
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the 5 samples exceed the Basin Plan water quality objective for thallium.

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. None of the 5 samples exceed the Basin Plan water quality objective for thallium 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5005
 
LOE ID: 1459
 
Pollutant: Thallium
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: Data were collected by RWQCB9 from 02/1998 to 02/2000. None of the 5 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thallium is 0.002 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 02/24/1998, 08/04/1998, 02/09/1999, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5104
 
Pollutant: Thiobencarb/Bolero
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 81 samples exceed the Basin Plan water quality objective for thiobencarb/bolero.

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. None of the 81 samples exceed the Basin Plan water quality objective for thiobencarb/bolero 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation: .
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5104
 
LOE ID: 1443
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thiobencarb is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1444
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 16
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 01/2001. None of the 16 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thiobencarb is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 01/2001. Samples were collected in 07/1997, 11/1997, on a quarterly basis from 1998-2000, and in 01/2001. Samples were collected once per sampling day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1437
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thiobencarb is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1438
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thiobencarb is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1439
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thiobencarb is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1440
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thiobencarb is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1441
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thiobencarb is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1442
 
Pollutant: Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 6
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 6 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Thiobencarb is 0.07 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5132
 
Pollutant: Toluene
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for toluene.

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. None of the 70 samples exceed the Basin Plan water quality objective for toluene 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5132
 
LOE ID: 1374
 
Pollutant: Toluene
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Toluene is 0.15 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1368
 
Pollutant: Toluene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Toluene is 0.15 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1369
 
Pollutant: Toluene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Toluene is 0.15 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1370
 
Pollutant: Toluene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Toluene is 0.15 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1372
 
Pollutant: Toluene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Toluene is 0.15 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1371
 
Pollutant: Toluene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Toluene is 0.15 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study
QAPP Information Reference(s):

 
LOE ID: 1373
 
Pollutant: Toluene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Toluene is 0.15 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1367
 
Pollutant: Toluene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Toluene is 0.15 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5099
 
Pollutant: Total Dissolved Solids
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 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 are available in the administrative record to assess this pollutant. Six of 8 samples exceed the Basin Plan water quality objective.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.

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. Six of 8 samples exceeded the Basin Plan criteria, and these exceed the allowable frequency listed in Table 3.2 of the Listing Policy. At the October 25th Water Board meeting, comments were received concerning total dissolved solids in terminal reservoirs in the San Diego region. The Board concluded that it was inappropriate to list these water bodies based on secondary MCLs when the TDS values of the incoming supplying waters were higher than the MCLs. Narrative standards are therefore met.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5099
 
LOE ID: 1462
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 6
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by RWQCB9 from 07/1997 to 11/2000. Six of 8 samples were in exceedance. At the October 25th Water Board meeting, comments were received concerning total dissolved solids in terminal reservoirs in the San Diego region. The Board concluded that it was inappropriate to list these water bodies based on secondary MCLs when the TDS values of the incoming supplying waters were higher than the MCLs. Narrative standards are therefore met.
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters and all beneficial uses is 500 mg/L. This concentration is not to be exceeded more than 10% of the time during any one year period.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected from 07/1997 to 11/2000 once per day on 8 days during this time span. Samples were collected mostly during the winter and summer months.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
4982
 
Pollutant: Trichloroethylene/TCE
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for trichloroethylene.

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. None of the 70 samples exceed the Basin Plan water quality objective for trichloroethylene 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4982
 
LOE ID: 1376
 
Pollutant: Trichloroethylene/TCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Trichloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1377
 
Pollutant: Trichloroethylene/TCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Trichloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1378
 
Pollutant: Trichloroethylene/TCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Trichloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1375
 
Pollutant: Trichloroethylene/TCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Trichloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1381
 
Pollutant: Trichloroethylene/TCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Trichloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1382
 
Pollutant: Trichloroethylene/TCE
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Trichloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1380
 
Pollutant: Trichloroethylene/TCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Trichloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1379
 
Pollutant: Trichloroethylene/TCE
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Trichloroethylene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
4983
 
Pollutant: Vinyl chloride
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceeded the Basin Plan water quality objective for vinyl chloride.

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. None of the 70 samples exceeded the Basin Plan water quality objective for vinyl chloride 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.
 
RWQCB Board Decision / Staff Recommendation:
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4983
 
LOE ID: 1385
 
Pollutant: Vinyl chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Vinyl Chloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1389
 
Pollutant: Vinyl chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Vinyl Chloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1383
 
Pollutant: Vinyl chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Vinyl Chloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1388
 
Pollutant: Vinyl chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Vinyl Chloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1387
 
Pollutant: Vinyl chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Vinyl Chloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1386
 
Pollutant: Vinyl chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Vinyl Chloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1390
 
Pollutant: Vinyl chloride
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: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Vinyl Chloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1384
 
Pollutant: Vinyl chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Vinyl Chloride is 0.0005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5055
 
Pollutant: Zinc
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant. None of the four samples exceed the Basin Plan water quality objective for zinc.

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. None of the four samples exceed the Basin Plan water quality objective for zinc 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5055
 
LOE ID: 1460
 
Pollutant: Zinc
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Data were collected by RWQCB 9 from 12/1997 to 02/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for zinc is 5.0 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected once per day on 12/15/1997, 06/17/1998, 07/15/1999, and 02/24/2000.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):
 
DECISION ID
5065
 
Pollutant: cis-1,2-Dichloroethylene
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for cis-1,2-dichloroethylene.

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. None of the 70 samples exceed the Basin Plan water quality objective for cis-1,2-dichloroethylene 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5065
 
LOE ID: 1306
 
Pollutant: cis-1,2-Dichloroethylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cis-1,2-Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1304
 
Pollutant: cis-1,2-Dichloroethylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cis-1,2-Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1309
 
Pollutant: cis-1,2-Dichloroethylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cis-1,2-Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1305
 
Pollutant: cis-1,2-Dichloroethylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cis-1,2-Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1308
 
Pollutant: cis-1,2-Dichloroethylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cis-1,2-Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1307
 
Pollutant: cis-1,2-Dichloroethylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cis-1,2-Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1310
 
Pollutant: cis-1,2-Dichloroethylene
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB 9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cis-1,2-Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1303
 
Pollutant: cis-1,2-Dichloroethylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for cis-1,2-Dichloroethylene is 0.006 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5047
 
Pollutant: meta-para xylenes
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for meta-para xylenes.

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. None of the 70 samples exceed the Basin Plan water quality objective for meta-para xylenes 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5047
 
LOE ID: 1340
 
Pollutant: meta-para xylenes
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1335
 
Pollutant: meta-para xylenes
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1339
 
Pollutant: meta-para xylenes
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1338
 
Pollutant: meta-para xylenes
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1337
 
Pollutant: meta-para xylenes
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1336
 
Pollutant: meta-para xylenes
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1342
 
Pollutant: meta-para xylenes
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB 9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1341
 
Pollutant: meta-para xylenes
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
4990
 
Pollutant: o-Dichlorobenzene
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Seven lines of evidence are available in the administrative record to assess this pollutant. None of the 66 samples exceed the Basin Plan water quality objective for o-Dichlorobenzene; all were 'non-detects'.

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. None of the 66 samples exceed the Basin Plan water quality objective for o-Dichlorobenzene; (all were 'non-detects'), 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4990
 
LOE ID: 1281
 
Pollutant: o-Dichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for o-Dichlorobenzene is 0.6 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1284
 
Pollutant: o-Dichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for o-Dichlorobenzene is 0.6 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1285
 
Pollutant: o-Dichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for o-Dichlorobenzene is 0.6 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1286
 
Pollutant: o-Dichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for o-Dichlorobenzene is 0.6 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1282
 
Pollutant: o-Dichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for o-Dichlorobenzene is 0.6 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1280
 
Pollutant: o-Dichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for o-Dichlorobenzene is 0.6 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1283
 
Pollutant: o-Dichlorobenzene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for o-Dichlorobenzene is 0.6 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5114
 
Pollutant: o-Xylene
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for o-xylene.

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. None of the 70 samples exceed the Basin Plan water quality objective for o-xylene 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5114
 
LOE ID: 1348
 
Pollutant: o-Xylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1349
 
Pollutant: o-Xylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1350
 
Pollutant: o-Xylene
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB 9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance. The sum of the 4 samples did not exceed 1.750 mg/L (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment.
QAPP Information Reference(s):

 
LOE ID: 1343
 
Pollutant: o-Xylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1344
 
Pollutant: o-Xylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1345
 
Pollutant: o-Xylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study
QAPP Information Reference(s):

 
LOE ID: 1346
 
Pollutant: o-Xylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1347
 
Pollutant: o-Xylene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance.
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for Xylenes is 1.750 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: MCL is for either a single isomer or the sum of the isomers. Incorporations by reference are prospective including future changes to the incorporated provisions as the changes take effect
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the minimum pool boundary east.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):
 
DECISION ID
5036
 
Pollutant: p-Dichlorobenzene (DCB)
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)(2006)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Eight lines of evidence are available in the administrative record to assess this pollutant. None of the 70 samples exceed the Basin Plan water quality objective for p-Dichlorobenzene.

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. None of the 70 samples exceed the Basin Plan water quality objective for p-Dichlorobenzene 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.
 
RWQCB Board Decision / Staff Recommendation: No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5036
 
LOE ID: 1275
 
Pollutant: p-Dichlorobenzene (DCB)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 10 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for p-Dichlorobenzene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the recreation area.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1274
 
Pollutant: p-Dichlorobenzene (DCB)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 12
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 12 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for p-Dichlorobenzene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the center of the minimum pool.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1273
 
Pollutant: p-Dichlorobenzene (DCB)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 9
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 9 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for p-Dichlorobenzene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Vista del Lago station.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12//1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study
QAPP Information Reference(s):

 
LOE ID: 1279
 
Pollutant: p-Dichlorobenzene (DCB)
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: Not Specified
Data Used to Assess Water Quality: Data were collected by RWQCB9 in 08/1998, 08/1999, 09/2000, and 10/2000. None of the 4 samples were in exceedance (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for p-Dichlorobenzene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir. Exact location was not reported.
Temporal Representation: Samples were collected on 08/11/1998, 08/24/1999, 09/5/2000, 10/04/2000. One sample was collected each day.
Environmental Conditions:
QAPP Information: Data used in 2002 assessment. QA=?
QAPP Information Reference(s):

 
LOE ID: 1278
 
Pollutant: p-Dichlorobenzene (DCB)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municial beneficial use, the WQO for p-Dichlorobenzene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near Gum Tree Cove Pond.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 07/12/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1272
 
Pollutant: p-Dichlorobenzene (DCB)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 13
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 13 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for p-Dichlorobenzene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir near the pump tower.
Temporal Representation: Samples were collected 1-2 times per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1277
 
Pollutant: p-Dichlorobenzene (DCB)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 7
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 09/1999. None of the 7 samples were in exceedance (USGS, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: From the Basin Plan: For inland surface waters with a municipal beneficial use, the WQO for p-Dichlorobenzene is 0.005 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Sweetwater Reservoir at the east end reservoir fill boundary.
Temporal Representation: Samples were collected once per day on one day every other month from 09/09/1998 to 09/20/1999.
Environmental Conditions:
QAPP Information: USGS: http://water.usgs.gov/owq/FieldManual/Data used in USGS Water Quality Monitoring Study.
QAPP Information Reference(s):

 
LOE ID: 1276
 
Pollutant: p-Dichlorobenzene (DCB)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Data were collected by the USGS from 09/1998 to 07/1999. None of the 8 samples were in exceedance (USGS, 2002).
Data Reference: Placeh