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

Supporting Information

Regional Board 4 - Los Angeles Region

Water Body Name: Santa Clara River Reach 3 (Freeman Diversion to A Street)
Water Body ID: CAR4032100019990203101738
Water Body Type: River & Stream
 
DECISION ID
5708
 
Pollutant: Total Dissolved Solids
Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)(2006)
Revision Status Revised
Sources: Source Unknown
Expected TMDL Completion Date: 2023
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for removal from the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a one line of evidence is necessary to assess delisting status.

Four lines of evidence are available in the administrative record to assess this pollutant. A sufficient number of 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 removing this water segment-pollutant combination from the section 303(d) list.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. 38 of 139 United Water Conservation District samples exceeded the TDS water quality objective and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy.
5. 13 of 51 County Sanitation District of Los Angeles County samples exceeded the TDS water quality objective and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy.
6. Two of 24 MS4 samples exceed the water quality objective from the Basin Plan for the Coastal Watersheds of Los Angeles and Ventura Counties and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
7. Zero of one SWAMP sample exceed the water quality objective from the Basin Plan for the Coastal Watersheds of Los Angeles and Ventura Counties and there are insufficient data to determine whether this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy.
8. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are 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 removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5708
 
LOE ID: 30240
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 24
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Two of 24 samples exceeded the water quality objective from the Basin Plan for the Coastal Watersheds of Los Angeles and Ventura Counties.
Data Reference: Monitoring Reports for the Storm Water Management/Urban Runoff Discharges for Ventura County Flood Control District, County of Ventura, and the cities of Ventura County NPDES Permit No. CAS004002
 
Water Quality Objective/Criterion: The Basin Plan lists specific water quality criterion of 1300 mg/L for total dissolved solids (TDS) for Santa Clara River Reach 3.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Ventura County Watershed Protect District conducted receiving water monitoring at the mass emission station, ME-SCR located at the Freeman Diversion.
Temporal Representation: Grab samples were taken during wet- and dry-weather events about six times a year from 2000 to 2006.
Environmental Conditions:
QAPP Information: Data collected for compliance with MS4.
QAPP Information Reference(s): Monitoring and reporting program No. CI 7388 for Storm Water Management/Urban Runoff Discharges for Ventura County Flood Control District, County of Ventura, and the cities of Ventura County NPDES Permit No. CAS004002
 
LOE ID: 30241
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 1
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Zero of one sample exceeded the water quality objective from the Basin Plan for the Coastal Watersheds of Los Angeles and Ventura Counties.
Data Reference: Surface Water Ambient Monitoring Program data for all watersheds in the Los Angeles Region 2001-2005.
 
Water Quality Objective/Criterion: The Basin Plan lists specific water quality criterion of 1300 mg/L for total dissolved solids (TDS) for Santa Clara River Reach 3.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: One monitoring station: 403STC082
Temporal Representation: Grab sample taken on 2/24/2003
Environmental Conditions:
QAPP Information: Data collected for compliance with SWAMP.
QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
 
LOE ID: 2097
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 139
Number of Exceedances: 38
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One hundred and eighty-nine samples, 38 samples exceeding.
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: Basin Plan: 1,300 mg/L.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples representative of Reach.
Temporal Representation: Quarterly sampling events.
Environmental Conditions:
QAPP Information: POTW, United Water Conservation District, Department of Water
Resources.
QAPP Information Reference(s):
 
LOE ID: 7874
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 51
Number of Exceedances: 13
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: 13 of 51 samples exceed Basin Plan objectives. Semi-annual ambient water quality samples for TDS were taken in compliance with the Santa Paula Water Reclamation Facility NDPES permit monitoring requirements.
Data Reference: NPDES receiving water monitoring reports for Santa Paula Water Reclamation Facility (NPDES No. CA0054224).
 
Water Quality Objective/Criterion: The Basin Plan lists specific water quality criterion of 1300 mg/L for total dissolved solids (TDS) for Santa Clara River Reach 3.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The County Sanitation District of Los Angeles County conducted sampling at Santa Clara Reach 5 at the following monitoring stations : R1 located at Peck drain at Converse Road Bridge at the edge of the river bed about half a mile above the confluence with the low flow river stream; R2 located about 300 feet upstream from confluence with Peck drain; and R3 located approximately 300 feet downstream from the confluence with Peck Drain.


Three monitoring stations: River 1, River 2, River 3
Temporal Representation: Grab samples were taken and analyzed on semi-annual basis from August 1999 to February 2007.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and monitoring procedures detailed in NPDES Permit No. CA0054224 Monitoring and Reporting Program.
QAPP Information Reference(s): Santa Paul Wastewater Reclamation Facility Monitoring and Reporting Program for NDPES No. CA0054224
  Santa Paul Wastewater Reclamation Facility Time Schedule Order for NDPES No. CA0054224  
 
DECISION ID
10524
 
Pollutant: Toxicity
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Sources: Source Unknown
Expected TMDL Completion Date: 2021
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.6 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status.

One line(s) of evidence is available in the administrative record to assess this pollutant.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for 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. Three of 22 samples exceed the water quality objective from the Basin Plan for the Coastal Watersheds of Los Angeles and Ventura Counties and this exceeds 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 met.
 
RWQCB Board Decision / Staff Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 10524
 
LOE ID: 21470
 
Pollutant: Toxicity
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Fish Migration | Preservation of Rare & Endangered Species | Wildlife Habitat
 
Number of Samples: 22
Number of Exceedances: 3
 
Data and Information Type: TOXICITY TESTING
Data Used to Assess Water Quality: Three of 22 samples exceeded the water quality objective from the Basin Plan for the Coastal Watersheds of Los Angeles and Ventura Counties.
Data Reference: Monitoring Reports for the Storm Water Management/Urban Runoff Discharges for Ventura County Flood Control District, County of Ventura, and the cities of Ventura County NPDES Permit No. CAS004002
 
Water Quality Objective/Criterion: The Basin Plan states at there shall be no acute or chronic toxicity in ambient waters outside mixing zones.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline: Toxicity was defined as a reduction of the NOEC below 100% and was considered significant if the effect on the sample exposure was greater than 25%. Chronic toxicity is further expressed as toxic units (TUc), where TUc = 100/NOEC.
The No Observable Effect Concentration (NOEC) is expressed as the maximum percent of receiving water that causes no observable effect on a test organism, as determined by the result of a critical life stage toxicity test. The NOEC is defined, in USEPA, 2002 as the the lowest concentration of toxicant to which organisms are exposed in a life-cycle or partial life-cycle (short-term) test, which causes adverse effects on the test organisms (i.e., where the values for the observed responses are statistically significantly different from the controls).
Guideline Reference: Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013
  FINAL Calleguas Creek Watershed Toxicity, Chlorpyrifos and Diazinon TMDL Technical Report. 2005. Submitted to Los Angeles Regional Water Quality Control Board. Prepared by Larry Walker Associates on behalf of the Calleguas Creek Watershed Management Plan. June 21, 2005.
 
Spatial Representation: Ventura County Watershed Protect District conducted receiving water monitoring at the mass emission station, ME-SCR located at the Freeman Diversion.
Temporal Representation: Grab samples were taken during wet- and dry-weather events about six times a year from 2000 to 2006.
Environmental Conditions:
QAPP Information: Data collected for compliance with MS4.
QAPP Information Reference(s): Monitoring and reporting program No. CI 7388 for Storm Water Management/Urban Runoff Discharges for Ventura County Flood Control District, County of Ventura, and the cities of Ventura County NPDES Permit No. CAS004002