Final California 2010 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 6 - Lahontan Region

Water Body Name:	Mojave River (below Lower Narrows)
Water Body ID:	CAR6285000020080817144436
Water Body Type:	River & Stream


DECISION ID	16627	Region 6
Mojave River (below Lower Narrows)

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This decision applies a State Water Board 2006 cycle "do not list" decision for the Mojave River as a whole to one of three segments created for the 2008 assessment cycle. No new data have been reviewed for 2008. 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 are available in the administrative record to assess this pollutant. None of the samples exceeds 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 satisfy the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfy the data quantity requirements of section 6.1.5 of the Policy. 3. None of 11 samples exceeded the water quality objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	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.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 16627, Ammonia	Region 6
Mojave River (below Lower Narrows)

LOE ID:

28723

Pollutant:

Ammonia

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Aquatic Life Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

None of the 11 samples collected "upstream" and "downstram" exceeded the calculated criteria for the 'one-hour' and '40day' ammonia criteria (VVWRA, 2004).

Data Reference:

Water quality data submission. (CD) Victor Valley, CA

Victor Valley Wastewater Reclamation Authority water quality data. Re: Ammonia and Nitrate data. Larry Walker and Associates

SWAMP Data:

Non-SWAMP

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:

Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency

Water Quality Control Plan for the Lahontan Region (as amended)

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 ias 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 Roberson 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	16628	Region 6
Mojave River (below Lower Narrows)

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This decision modifies a 2006 cycle "do not list" decision by the State Board for the Mojave River as a whole by applying it to one of three segments created for the 2008 assessment cycle. No new data have been reviewed for 2008. 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 samples exceeds 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 satisfy the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfy the data quantity requirements of section 6.1.5 of the Policy. 3. None of 3 samples exceeded the 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.

Regional Board Decision 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.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 16628, Chloride	Region 6
Mojave River (below Lower Narrows)

LOE ID:

28722

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

There wre 3 "upstream" meansurements. The Annual Average and 90th Percentile Values did not exceed the WQO for Chloride (VVWRA, 2004).

Data Reference:

Water quality data submission. (CD) Victor Valley, CA

SWAMP Data:

Non-SWAMP

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:

Water Quality Control Plan for the Lahontan Region (as amended)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

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	16629	Region 6
Mojave River (below Lower Narrows)

Pollutant:	Sulfates
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This decision modifies a 2006 cycle "do not list" decision by the State Water Board for the Mojave River as a whole by applying it to one of three segments created for the 2008 assessment cycle. No new data have been reviewed. 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 samples exceeds 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 satisfy the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfy the data quantity requirements of section 6.1.5 of the Policy. 3. None of three samples exceeded the 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.

Regional Board Decision 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.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 16629, Sulfates	Region 6
Mojave River (below Lower Narrows)

LOE ID:

28724

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

There wre 3 "upstream" meansurements. The Annual Average and the 90th Percentile Values of these measurements did not exceed the Water Quality Objective for sulfate (VVWRA, 2004).

Data Reference:

Water quality data submission. (CD) Victor Valley, CA

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

40 mg/L Annual Average and 100mg/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:

Water Quality Control Plan for the Lahontan Region (as amended)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

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	16630	Region 6
Mojave River (below Lower Narrows)

Pollutant:	Tetrachloroethylene/PCE
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This decision modifies a 2006 cycle "do not list" decision by the State Water Board for the Mojave River as a whole by applying it to one of three water body segments created for the 2008 assessment cycle. No new data have been reviewed. 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 exceeds the California Toxics Rule standard. 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 satisfy the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfy the data quantity requirements of section 6.1.5 of the Policy. 3. None of 12 samples exceeded the California Toxics Rule standard and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	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.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 16630, Tetrachloroethylene/PCE	Region 6
Mojave River (below Lower Narrows)

LOE ID:

28720

Pollutant:

Tetrachloroethylene/PCE

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

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:

Water quality data submission. (CD) Victor Valley, CA

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

2.7 ppb(CTR value for Human Health-Freshwater).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Sampling occurred bimonthly 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	16631	Region 6
Mojave River (below Lower Narrows)

Pollutant:	Trichloroethylene/TCE
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This decision modifies a 2006 cycle "do not list" decision by the State Water Board for the Mojave River as a whole by applying it to one of 3 segments created for the 2008 assessment cycle. No new data have been reviewed. 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 exceeds the California Toxics Rule standard. 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 satisfy the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfy the data quantity requirements of section 6.1.5 of the Policy. 3. None of 12 samples exceeded the California Toxics Rule standard and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	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.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 16631, Trichloroethylene/TCE	Region 6
Mojave River (below Lower Narrows)

LOE ID:

28721

Pollutant:

Trichloroethylene/TCE

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

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:

Water quality data submission. (CD) Victor Valley, CA

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

2.7 ppb(CTR value for Human Health-Freshwater).

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Sampling occurred bimonthly 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):