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

Supporting Information

Regional Board 6 - Lahontan Region

Water Body Name: Mojave River
Water Body ID: CAR6288200019980804163454
Water Body Type: River & Stream
 
DECISION ID
4245
 
Pollutant: Ammonia
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(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 samples exceed the water quality objective.

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

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 11 samples exceeded the ammonia water quality objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation: This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4245
 
LOE ID: 2850
 
Pollutant: Ammonia
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 11
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: None of the 11 samples collected "upstream" and "downstream" exceeded the calculated criteria for the 'one-hour' and '4-day' ammonia criteria (VVWRA, 2004).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: Ammonia objective (per Region 6 basin Plan) based on formulas which factor in pH and Temperature [used spreadsheet provided by RWQCB staff (Bruce Warden)].
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: "Upstream" site located 3.5 miles upstream (south) of the confluence of the facility discharge with the Mojave River at a point in the channel immediately downstream of the Old National Trails Bridge on Route 66. "Downstream" site as located in the channel 1.75 miles downstream (north) of the confluence of the Facility discharge with the Mojave River at the point approximately west of the intersection of Robertson Ranch Road and National Trails Highway (Route 66).
Temporal Representation: Samples collected quarterly between July 2001 and January 2004.
Environmental Conditions:
QAPP Information: Data collected for NPDES permit compliance for WBID No. 6B360109001, NPDES No. CA01002822.
QAPP Information Reference(s):
 
DECISION ID
4223
 
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 3.1 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 samples exceed the water quality objective.

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

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 3 samples exceeded the chloride water quality objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation: This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4223
 
LOE ID: 2847
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: There were 3 "upstream" measurements. The Annual Average and 90th Percentile Values did not exceed the WQO for Chloride (VVWRA, 2004).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: 75mg/L Annual Average and 100mg/L 90th Percentile Value (objectives from the Lahontan RWQCB Basin Plan for the Mojave River at Victorville [Table 3-21 from the Water Quality Control Plan for the Lahontan Region])
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: "Upstream" site located 3.5 miles upstream (south) of the confluence of the facility discharge with the Mojave River at a point in the channel immediately downstream of the Old National Trails Bridge on Route 66.
Temporal Representation: Sampling occurred on 6/25/2001, 8/27/2001, and 11/20/2001.
Environmental Conditions:
QAPP Information: Data collected for NPDES permit compliance for WBID No. 6B360109001, NPDES No. CA01002822.
QAPP Information Reference(s):
 
DECISION ID
4246
 
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. One of the samples exceed the water quality objective.

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

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 3 samples exceeded the sulfate water quality objective 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: This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4246
 
LOE ID: 2851
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: There were three "upstream" measurements. The Annual Average and the 90th Percentile Values of these measurements did not exceed the Water Quality Objective for sulfate (VVWRA, 2004).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: 40 mg/L Annual Average Value and 100 mg/L 90th Percentile Value (Sulfate objective for the Mojave River at Victorville [Table 3-21 from the Water Quality Control Plan for the Lahontan Region])
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: "Upstream" site located 3.5 miles upstream (south) of the confluence of the facility discharge with the Mojave River at a point in the channel immediately downstream of the Old National Trails Bridge on Route 66.
Temporal Representation: Samples collected between 6/26/2001 and 11/20/2001.
Environmental Conditions:
QAPP Information: Data collected for NPDES permit compliance for WBID No. 6B360109001, NPDES No. CA01002822.
QAPP Information Reference(s):
 
DECISION ID
4244
 
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.

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

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

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 12 samples exceeded the tetrachloroethylene water quality criterion 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: This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
 
SWRCB Board Decision / Staff Recommendation: \
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4244
 
LOE ID: 2849
 
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: None of the 12 upstream measurements exceeded the WQO for PCE (VVWRA, 2004).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: 2.7 ppb (CTR value for Human Health-Freshwater).
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: "Upstream" site located 3.5 miles upstream (south) of the confluence of the facility discharge with the Mojave River at a point in the channel immediately downstream of the Old National Trails Bridge on Route 66.
Temporal Representation: Sampling occurred bi-monthly from 12/10/2001 to 5/14/2002.
Environmental Conditions:
QAPP Information: Data collected for NPDES permit compliance for WBID No. 6B360109001, NPDES No. CA01002822.
QAPP Information Reference(s):
 
DECISION ID
4243
 
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.

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

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

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 12 samples exceeded the trichloroethylene water quality criterion 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: This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4243
 
LOE ID: 2848
 
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: None of the 12 'upstream' samples exceeded the objective for TCE.
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: 2.7 ppb (CTR value for Human Health-Freshwater)
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: "Upstream" site located 3.5 miles upstream (south) of the confluence of the facility discharge with the Mojave River at a point in the channel immediately downstream of the Old National Trails Bridge on Route 66.
Temporal Representation: Samples collected bimonthly from 12/10/2001 through 5/14/2001
Environmental Conditions:
QAPP Information: Data collected for NPDES permit compliance for WBID No. 6B360109001, NPDES No. CA01002822.
QAPP Information Reference(s):