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

Supporting Information

Regional Board 4 - Los Angeles Region

Water Body Name: Santa Clara River Reach 6 (W Pier Hwy 99 to Bouquet Cyn Rd) (was named Santa Clara River Reach 8 on 2002 303(d) list)
Water Body ID: CAR4035100019990204123459
Water Body Type: River & Stream
 
DECISION ID
4205
 
Pollutant: Ammonia
Final Listing Decision: Delist from 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (being addressed by USEPA approved TMDL)(2006)
Revision Status Revised
Reason for Delisting: State determines water quality standard is being met
TMDL Name: Santa Clara River Nitrogen
TMDL Project Code: 227
Date TMDL Approved by USEPA: 03/18/2004
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for removal from the section 303(d) list under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Three lines of evidence are available in the administrative record to assess this pollutant.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for 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. One of 75 samples exceeded the pH and temperature dependent Basin Plan 30-day average objective for ammonia and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy.
4. A remedial program other than a TMDL had been developed, approved, and implemented. This program was expected to result in attainment of the standard.
5. The USEPA final decision for the 2006 303(d) list added this listing to the 'being addressed by USEPA approved TMDL' portion of the 303(d) List because the Santa Clara River Nitrogen TMDL and implementation plan was approved for this water segment-pollutant combination by USEPA on 03/18/2004.
6. Analysis of the data, after USEPA approval of the TMDL and implementation of nitrification and denitrification, indicate that standards are being currently attained.
7. Pursuant to section 4.11 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 be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4205
 
LOE ID: 30260
 
Pollutant: Ammonia
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Freshwater Replenishment | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat
 
Number of Samples: 32
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: 0 of 32 samples exceeded the pH and temperature dependent Basin Plan 30-day average objective for ammonia. Water quality samples were taken and analyzed for ammonia in accordance with the Saugus Water Reclamation Plant permit monitoring and testing parameters.
Data Reference: NPDES receiving water monitoring reports for Saugus Water Reclamation Plant (NPDES No. CA0054313) and Valencia Water Reclamation Plant (NPDES No. CA0054216).
 
Water Quality Objective/Criterion: The Basin Plan states, "In order to protect aquatic life, ammonia concentrations in inland surface waters characteristic of freshwater shall not exceed the values calculated for the appropriate instream conditions shown in Tables 3-1 to 3-3." The one-hour average objective is dependent on pH and the presence or absence of early life stages of fish (ELS) but not temperature. The 30-day average objective is dependent on pH, temperature and ELS in Tables 3-1 to 3-3. The ammonia objectives and the pH and temperature dependent formulas are found in Attachment A of Regional Board Resolution No. 2002-011.
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: Samples were taken at three monitoring stations:
R-A Santa Clara River approximately 300 feet upstream of point of discharge 001 to river, R-B Santa Clara River approximately 100 feet downstream of point of discharge 001 to river, and RB01.
Temporal Representation: Grab samples taken and analyzed on a monthly basis from November 2005 to February 2007.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and monitoring procedures detailed in Sanitation Districts of Los Angeles County (NPDES No. CA0054313) Monitoring and Reporting Program.
QAPP Information Reference(s): Monitoring and Reporting Program No. CI-2960 for County Sanitation Districts of Los Angeles County (Saugus Water Reclamation Plant) (NPDES NO. CA0054313)
 
LOE ID: 2133
 
Pollutant: Ammonia
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 43
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of 43 samples exceeded the 30-day average water quality objective and none of 47 samples exceeded the one-hour average water quality objective (LACSD, 2004b; LACSD, 2006).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: Los Angeles RWQCB Basin Plan Amendment 2003: The one-hour average objective is dependent on pH and the presence or absence of early life stages of fish (ELS) but not temperature. The 30-day average objective is dependent on pH, temperature and ELS [Tables 3-1 to 3-3].
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: USEPA 1999 Update of Ambient Water Quality Criteria for Ammonia.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Two receiving water stations: RB and RB01.
Temporal Representation: Samples were collected from October 2003 through October 2005. New management practices were begun at the beginning of this period and may have resulted in a change in water quality. Water quality measurements collected before the implementation of management measures were not considered representative of current conditions.
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
LOE ID: 2131
 
Pollutant: Ammonia
LOE Subgroup: Narrative Description Data
Matrix: Not Specified
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: New data was not submitted during the listing cycle that indicated that water quality standards are met. (SWAMP, 2004).

An alternative enforceable program is in place that will address ammonia
water quality standards exceedances for this Reach.

In June 1995, the seven water reclamation plants discharging in the San
Gabriel River and Santa Clara River watersheds received NPDES permits
containing requirements regarding compliance with the Basin Plan water
quality objectives for ammonia. In accordance with these permits, the Los
Angeles County Sanitation Districts have been pursuing the addition of
nitrification and denitrification facilities at each of these plants to comply
with the ammonia objectives. By June 2003, it is expected that these new
facilities will be operational and ammonia will be drastically reduced.
Research facility operation shows that the monthly average ammonia
concentration fully complies with the chronic ammonia objective that are
expected to be applicable in June 2003 (SWRCB, 2003).

It is probable that the majority of ammonia discharged to this water body
was contributed by POTWs. Information in the record indicates that the
majority (over 95%) of the ammonia in the Los Angeles River was
contributed by POTWs. It is probable that the contribution in the San
Gabriel River watershed is dominated by contributions from POTWs as
well. Generally, concentrations of ammonia upstream of the treatment
plants is much lower than downstream concentrations (up to an order of
magnitude difference).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
DECISION ID
9451
 
Pollutant: Bis(2ethylhexyl)phthalate (DEHP)
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
 
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.

Two lines of evidence are 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 not sufficient justification for placing the 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. There are zero of 15 MS4 samples that exceed the CTR human health for consumption of water and organisms and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. There are zero of 8 Saugus WWRP samples that exceed the CTR human health for consumption of water and organisms and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
5. Pursuant to section 4.11 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 exceeded.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 9451
 
LOE ID: 30237
 
Pollutant: Bis(2ethylhexyl)phthalate (DEHP)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Zero of eight samples exceeded the CTR human health for consumption of water and organisms.
Data Reference: NPDES receiving water monitoring reports for Saugus Water Reclamation Plant (NPDES No. CA0054313) and Valencia Water Reclamation Plant (NPDES No. CA0054216).
 
Water Quality Objective/Criterion: The CTR water quality standard for Bis(2ethylhexyl)phthalate: Human Health-freshwater (water & organisms) is 1.8 ppb.
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
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at two stations:
R-A Santa Clara River approximately 300 feet upstream of point of discharge 001 to River
R-B Santa Clara River approximately 100 feet downstream of point of discharge 001 to River.
Temporal Representation: Grab samples taken and analyzed on semi-annual basis from July 2004 to February 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Monitoring and Reporting Program, No. CI-2960, for County Sanitation Districts of Los Angeles County, Saugus Water Reclamation Plant, (NPDES NO. CA0054313).
QAPP Information Reference(s): Monitoring and Reporting Program No. CI-2960 for County Sanitation Districts of Los Angeles County (Saugus Water Reclamation Plant) (NPDES NO. CA0054313)
 
LOE ID: 7857
 
Pollutant: Bis(2ethylhexyl)phthalate (DEHP)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 15
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Zero of 15 samples exceeded the CTR human health for consumption of water and organisms. The data used was the monitoring data submitted as required by the Ventura County MS4 permit (NPDES # CAS004002).
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 CTR water quality standard for Bis(2ethylhexyl)phthalate: Human Health-freshwater (water & organisms) is 1.8 ppb.
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
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at the Mass Emission Santa Clara River Monitoring Station (S29). Station S29 is located near Interstate 5 about 1.5 miles west of the confluence with San Francisquito Creek (Lat 34.42660, Long -118.58649).
Temporal Representation: Grab samples taken and analyzed from October 2004 to February 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Ventura County MS4 Permit Monitoring and Reporting Program.
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
 
DECISION ID
17217
 
Pollutant: Benthic-Macroinvertebrate Bioassessments
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Sources: Nonpoint Source | Point Source
Expected TMDL Completion Date: 2021
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for the section 303(d) list under section 3.9 of the Listing Policy. Under section 3.9, waters are listed when a bioassessment shows diminished numbers of species or other metrics (compared to a reference site) and it is associated with another pollutant.

Eight lines of evidence are available in the administrative record to assess this pollutant. Benthic macroinvertebrates as measured by Southern California IBI (index of biological integrity) in Santa Clara Reach 6 were poor in October of 2003 and poor in October of 2004 indicating impairment of benthic community structure. This impairment is associated with impairment for ammonia, chloride, chlorpyriphos, diazinon, copper, and iron.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification to place the 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. There is at least one bioassessment sample (Index of Biological Integrity score) to satisfy Section 3.9
4. The impairment is associated with another pollutant in the waterbody to satisfy Section 3.9.
5. 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 be added to the section 303(d) list because applicable water quality standards are not being attained.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 17217
 
LOE ID: 7849
 
Pollutant: Iron
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Freshwater Replenishment | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat
 
Number of Samples: 20
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Two of 20 samples exceeded the U.S. Environmental Protection Agency National Recommended Water Quality Criteria for Freshwater Aquatic Life Protection.
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 U.S. Environmental Protection Agency National Recommended Water Quality Criteria for Freshwater Aquatic Life Protection is 1 mg/L.
Objective/Criterion Reference: National recommended water quality criteria: 2002. EPA-822-R-02-047 Washington, D.C. USEPA
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at the Mass Emission Santa Clara River Monitoring Station (S29). Station S29 is located near Interstate 5 about 1.5 miles west of the confluence with San Francisquito Creek (Lat 34.42660, Long -118.58649).
Temporal Representation: Grab samples taken and analyzed from October 2003 to February 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Ventura County MS4 Permit Monitoring and Reporting Program.
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: 7838
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Freshwater Replenishment | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat
 
Number of Samples: 20
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Two of 20 samples exceeded the California Toxics Rule Criterion Continuous Concentration for copper. Water quality samples were taken and analyzed for copper in accordance with the Municipal Separate Storm Sewer System (MS4) permit monitoring and testing parameters.
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 California Toxics Rule lists Criterion Maximum Concentrations and Criterion Continuous Concentrations for copper to protect aquatic life in freshwater. The copper criteria in freshwater is hardness dependent for each sample and varies based on the on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for metals criteria.
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
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at the Mass Emission Santa Clara River Monitoring Station (S29). Station S29 is located near Interstate 5 about 1.5 miles west of the confluence with San Francisquito Creek (Lat 34.42660, Long -118.58649).
Temporal Representation: Grab samples were taken and analyzed from October 31, 2003 to April 2, 2007.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and monitoring procedures detailed in County of Ventura MS4 Permit (NPDES No. CAS004002) Monitoring and Reporting Program.
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: 2135
 
Pollutant: Diazinon
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 29
Number of Exceedances: 28
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Twenty-eight of 29 samples exceed the guideline (SWAMP, 2004).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: CDFG Hazard Assessment Criteria 0.16 ug/L 1-hour average (acute), 0.10 ug/L 4-day (chronic) average (Siepman & Finlayson, 2000; Finlayson, 2004).
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Six stations.
Temporal Representation: Samples were collected from August 2002 through April 2003.
Environmental Conditions: The Santa Clara River Reach 6 monitoring stations are located between Bouquet Canyon Road Bridge and West Point Highway 99.
QAPP Information: SWAMP Quality Assurance Plan.
QAPP Information Reference(s):
 
LOE ID: 2134
 
Pollutant: Chlorpyrifos
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 39
Number of Exceedances: 10
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Thirty-nine water samples, 10 samples exceeding the 4 day average. All exceedances were from Station STCBQT (SWAMP, 2004; LACDPW, 2003a; Newhall Land and Farming Co., 2006).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: CDFG Aquatic life toxicity one hour average: 0.08 mg/l and 4 day average: 0.05 mg/L.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: The Santa Clara River Reach 6 monitoring stations are located between Bouquet Canyon Road Bridge and West Point Highway 99.
Temporal Representation: Samples were collected from August 2002 through April 2003.
Environmental Conditions:
QAPP Information: SWAMP Quality Assurance Plan.
QAPP Information Reference(s):
 
LOE ID: 30228
 
Pollutant: Benthic-Macroinvertebrate Bioassessments
LOE Subgroup: Population/Community Degradation
Matrix: Water
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Freshwater Replenishment | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Benthic macroinvertebrate surveys
Data Used to Assess Water Quality: The IBI scores at this site ranked in the “poor” range (20 in 2003 and 19 in 2004).
Data Reference: Los Angeles County 1994-2005 Integrated Receiving Water Impacts Report. Section 9, Santa Clara River Watershed Management Area, pp 9.1 - 9.19.
 
Water Quality Objective/Criterion: Los Angeles RWQCB Basin Plan Objectives for Toxicity which states “All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant or animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration or other appropraite methods as specified by the State or Regional Board.”
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: The IBI is a multi-metric assessment that employs biological metrics that respond to a habitat or water quality impairment. Each of the biological metrics measured at a site are converted to an IBI score then summed. These cumulative scores are then ranked according to very good (80-56), good (41-55), fair (27-40), poor (14-26) and very poor (0-13) habitat conditions. Sites with scores below 26 are considered to have impaired conditions.
Guideline Reference: A Quantitative Tool for Assessing the Integrity of Southern Coastal California Streams. Environmental Management Vol. 35, No. 4, pp. 493-504.
  Los Angeles County 1994-2005 Integrated Receiving Water Impacts Report. Section 3, Methods, pp3.1 - 3.28
  Los Angeles County 1994-2005 Integrated Receiving Water Impacts Report. Section 9, Santa Clara River Watershed Management Area, pp 9.1 - 9.19.
 
Spatial Representation: One site in the Santa Clara was sampled, at the Old Road, the DPW mass emission site, at N 34º 25.843’ W 118º 35.652’ .
Temporal Representation: Sites were sampled in October of 2003 and October of 2004.
Environmental Conditions: Benthic macroinvertebrate populations and IBI scores may also be affected by a wide range of anthropogenic stressors.
QAPP Information: Data was collected in compliance with California Stream Bioassessment Procedure.
QAPP Information Reference(s): California Stream Bioassessment Procedure (Protocol Brief for Biological and Physical/Habitat Assessment in Wadeable Streams) California Department of Fish and Game Water Pollution Control Laboratory Aquatic Bioassessment Laboratory Revision Date - December, 2003
  Los Angeles County 1994-2005 Integrated Receiving Water Impacts Report. Section 3, Methods, pp3.1 - 3.28
 
LOE ID: 2131
 
Pollutant: Ammonia
LOE Subgroup: Narrative Description Data
Matrix: Not Specified
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: New data was not submitted during the listing cycle that indicated that water quality standards are met. (SWAMP, 2004).

An alternative enforceable program is in place that will address ammonia
water quality standards exceedances for this Reach.

In June 1995, the seven water reclamation plants discharging in the San
Gabriel River and Santa Clara River watersheds received NPDES permits
containing requirements regarding compliance with the Basin Plan water
quality objectives for ammonia. In accordance with these permits, the Los
Angeles County Sanitation Districts have been pursuing the addition of
nitrification and denitrification facilities at each of these plants to comply
with the ammonia objectives. By June 2003, it is expected that these new
facilities will be operational and ammonia will be drastically reduced.
Research facility operation shows that the monthly average ammonia
concentration fully complies with the chronic ammonia objective that are
expected to be applicable in June 2003 (SWRCB, 2003).

It is probable that the majority of ammonia discharged to this water body
was contributed by POTWs. Information in the record indicates that the
majority (over 95%) of the ammonia in the Los Angeles River was
contributed by POTWs. It is probable that the contribution in the San
Gabriel River watershed is dominated by contributions from POTWs as
well. Generally, concentrations of ammonia upstream of the treatment
plants is much lower than downstream concentrations (up to an order of
magnitude difference).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
LOE ID: 2125
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Unspecified-- This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
LOE ID: 2133
 
Pollutant: Ammonia
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 43
Number of Exceedances: 1
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: One of 43 samples exceeded the 30-day average water quality objective and none of 47 samples exceeded the one-hour average water quality objective (LACSD, 2004b; LACSD, 2006).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: Los Angeles RWQCB Basin Plan Amendment 2003: The one-hour average objective is dependent on pH and the presence or absence of early life stages of fish (ELS) but not temperature. The 30-day average objective is dependent on pH, temperature and ELS [Tables 3-1 to 3-3].
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: USEPA 1999 Update of Ambient Water Quality Criteria for Ammonia.
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: Two receiving water stations: RB and RB01.
Temporal Representation: Samples were collected from October 2003 through October 2005. New management practices were begun at the beginning of this period and may have resulted in a change in water quality. Water quality measurements collected before the implementation of management measures were not considered representative of current conditions.
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):
 
DECISION ID
9455
 
Pollutant: Chlorodibromomethane
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Sources: Unknown Point Source
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 3.1 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.

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. Four of eight samples exceeded the CTR Human Health Criteria for Water & Organisms 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 9455
 
LOE ID: 8968
 
Pollutant: Chlorodibromomethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 8
Number of Exceedances: 4
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: The data used was the monitoring data submitted as required by the Monitoring and Reporting Program, No. CI-2960, for County Sanitation Districts of Los Angeles County, Saugus Water Reclamation Plant, (NPDES NO. CA0054313).
Data Reference: NPDES receiving water monitoring reports for Saugus Water Reclamation Plant (NPDES No. CA0054313) and Valencia Water Reclamation Plant (NPDES No. CA0054216).
 
Water Quality Objective/Criterion: The CTR Human Health Criteria for Water & Organisms. for Dibromochloromethane is 0.401 ug/L.
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
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at two stations:
R-A Santa Clara River approximately 300 feet upstream of point of discharge 001 to River
R-B Santa Clara River approximately 100 feet downstream of point of discharge 001 to River
Temporal Representation: 8 grab samples were taken and analyzed from July 14, 2004 to February 14, 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Monitoring and Reporting Program, No. CI-2960, for County Sanitation Districts of Los Angeles County, Saugus Water Reclamation Plant, (NPDES NO. CA0054313).
QAPP Information Reference(s): Monitoring and Reporting Program No. CI-2960 for County Sanitation Districts of Los Angeles County (Saugus Water Reclamation Plant) (NPDES NO. CA0054313)
 
DECISION ID
9431
 
Pollutant: Copper
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Sources: Nonpoint Source | Point Source
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 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Two lines of evidence are 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. Two of 20 samples exceeded the California Toxics Rule Criterion Continuous Concentration for copper in the dissolved fraction and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy.
4. One of 39 samples exceeded the California Toxics Rule Criterion Continuous Concentration for copper in the total fraction and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
5. 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 for copper in the dissolved fraction.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 9431
 
LOE ID: 30234
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Freshwater Replenishment | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat
 
Number of Samples: 39
Number of Exceedances: 1
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: One of 39 samples for dissolved copper exceeded the CTR Freshwater chronic criteria.
Data Reference: NPDES receiving water monitoring reports for Saugus Water Reclamation Plant (NPDES No. CA0054313) and Valencia Water Reclamation Plant (NPDES No. CA0054216).
 
Water Quality Objective/Criterion: The California Toxics Rule lists Criterion Continuous Concentrations for copper to protect aquatic life in freshwater. The copper criterion in freshwater is hardness dependent for each sample and varies based on the on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for metals criterion.
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
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at two stations:
R-A Santa Clara River approximately 300 feet upstream of point of discharge 001 to River
R-B Santa Clara River approximately 100 feet downstream of point of discharge 001 to River
Temporal Representation: Grab samples taken and analyzed from June 2004 to February 2007.
Environmental Conditions:
QAPP Information: Data collected for compliance with Saugus WWRP MRP.
QAPP Information Reference(s): Monitoring and Reporting Program No. CI-2960 for County Sanitation Districts of Los Angeles County (Saugus Water Reclamation Plant) (NPDES NO. CA0054313)
 
LOE ID: 7838
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Freshwater Replenishment | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat
 
Number of Samples: 20
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Two of 20 samples exceeded the California Toxics Rule Criterion Continuous Concentration for copper. Water quality samples were taken and analyzed for copper in accordance with the Municipal Separate Storm Sewer System (MS4) permit monitoring and testing parameters.
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 California Toxics Rule lists Criterion Maximum Concentrations and Criterion Continuous Concentrations for copper to protect aquatic life in freshwater. The copper criteria in freshwater is hardness dependent for each sample and varies based on the on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for metals criteria.
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
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at the Mass Emission Santa Clara River Monitoring Station (S29). Station S29 is located near Interstate 5 about 1.5 miles west of the confluence with San Francisquito Creek (Lat 34.42660, Long -118.58649).
Temporal Representation: Grab samples were taken and analyzed from October 31, 2003 to April 2, 2007.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and monitoring procedures detailed in County of Ventura MS4 Permit (NPDES No. CAS004002) Monitoring and Reporting Program.
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
 
DECISION ID
9450
 
Pollutant: Dichlorobromomethane
Final Listing Decision: List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: New Decision
Revision Status Revised
Sources: Unknown Point Source
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 3.1 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.

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. Six of eight samples exceeded the CTR Human Health Criteria for Water & Organisms 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 9450
 
LOE ID: 8754
 
Pollutant: Dichlorobromomethane
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 8
Number of Exceedances: 6
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: The data used was the monitoring data submitted as required by the Monitoring and Reporting Program, No. CI-2960, for County Sanitation Districts of Los Angeles County, Saugus Water Reclamation Plant, (NPDES NO. CA0054313).
Data Reference: NPDES receiving water monitoring reports for Saugus Water Reclamation Plant (NPDES No. CA0054313) and Valencia Water Reclamation Plant (NPDES No. CA0054216).
 
Water Quality Objective/Criterion: The CTR Human Health Criteria for Water & Organisms for Dibromochloromethane is 0.56 ppb.
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
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at two stations:
R-A Santa Clara River approximately 300 feet upstream of point of discharge 001 to River
R-B Santa Clara River approximately 100 feet downstream of point of discharge 001 to River
Temporal Representation: 8 grab samples were taken and analyzed from July 14, 2004 to February 14, 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Monitoring and Reporting Program, No. CI-2960, for County Sanitation Districts of Los Angeles County, Saugus Water Reclamation Plant, (NPDES NO. CA0054313).
QAPP Information Reference(s): Monitoring and Reporting Program No. CI-2960 for County Sanitation Districts of Los Angeles County (Saugus Water Reclamation Plant) (NPDES NO. CA0054313)
 
DECISION ID
9449
 
Pollutant: Iron
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 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Two lines of evidence are 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. Two of 29 MS4 samples exceeded the U.S. Environmental Protection Agency National Recommended Water Quality Criteria for Freshwater Aquatic Life Protection and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Two of ten Saugus Water Reclamation Plant samples exceeded the U.S. Environmental Protection Agency National Recommended Water Quality Criteria for Freshwater Aquatic Life Protection and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy.
5. 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 9449
 
LOE ID: 7849
 
Pollutant: Iron
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Freshwater Replenishment | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat
 
Number of Samples: 20
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Two of 20 samples exceeded the U.S. Environmental Protection Agency National Recommended Water Quality Criteria for Freshwater Aquatic Life Protection.
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 U.S. Environmental Protection Agency National Recommended Water Quality Criteria for Freshwater Aquatic Life Protection is 1 mg/L.
Objective/Criterion Reference: National recommended water quality criteria: 2002. EPA-822-R-02-047 Washington, D.C. USEPA
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at the Mass Emission Santa Clara River Monitoring Station (S29). Station S29 is located near Interstate 5 about 1.5 miles west of the confluence with San Francisquito Creek (Lat 34.42660, Long -118.58649).
Temporal Representation: Grab samples taken and analyzed from October 2003 to February 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Ventura County MS4 Permit Monitoring and Reporting Program.
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: 30236
 
Pollutant: Iron
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Warm Freshwater Habitat
Aquatic Life Use: Freshwater Replenishment | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat
 
Number of Samples: 10
Number of Exceedances: 2
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Two of 10 samples exceeded the U.S. Environmental Protection Agency National Recommended Water Quality Criteria for Freshwater Aquatic Life Protection.
Data Reference: NPDES receiving water monitoring reports for Saugus Water Reclamation Plant (NPDES No. CA0054313) and Valencia Water Reclamation Plant (NPDES No. CA0054216).
 
Water Quality Objective/Criterion: The U.S. Environmental Protection Agency National Recommended Water Quality Criteria for Freshwater Aquatic Life Protection is 1 mg/L.
Objective/Criterion Reference: National recommended water quality criteria: 2002. EPA-822-R-02-047 Washington, D.C. USEPA
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at two stations:
R-A Santa Clara River approximately 300 feet upstream of point of discharge 001 to River
R-B Santa Clara River approximately 100 feet downstream of point of discharge 001 to River.
Temporal Representation: Grab samples taken and analyzed from July 2004 to February 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Monitoring and Reporting Program, No. CI-2960, for County Sanitation Districts of Los Angeles County, Saugus Water Reclamation Plant, (NPDES NO. CA0054313).
QAPP Information Reference(s): Monitoring and Reporting Program No. CI-2960 for County Sanitation Districts of Los Angeles County (Saugus Water Reclamation Plant) (NPDES NO. CA0054313)
 
DECISION ID
9448
 
Pollutant: Specific Conductance
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 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

Three lines of evidence are available in the administrative record to assess this pollutant.

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. Five of eight SWAMP samples exceeded the Agricultural Water Quality Goals published by the Food and Agriculture Organization of the United Nations and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy.
4. 12 of 21 MS4 samples exceeded the Agricultural Water Quality Goals published by the Food and Agriculture Organization of the United Nations and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy.
5. 64 of 68 Saugus Water Reclamation Plant samples exceeded the Agricultural Water Quality Goals published by the Food and Agriculture Organization of the United Nations and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy.
6. 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 9448
 
LOE ID: 30232
 
Pollutant: Specific Conductance
LOE Subgroup: Subgroup Missing
Matrix: Water
Fraction: Total
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 68
Number of Exceedances: 64
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: The data used was the monitoring data submitted as required by the Monitoring and Reporting Program, No. CI-2960, for County Sanitation Districts of Los Angeles County, Saugus Water Reclamation Plant, (NPDES NO. CA0054313).
Data Reference: NPDES receiving water monitoring reports for Saugus Water Reclamation Plant (NPDES No. CA0054313) and Valencia Water Reclamation Plant (NPDES No. CA0054216).
 
Water Quality Objective/Criterion: The Agricultural Water Quality Goals published by the Food and Agriculture Organization of the United Nations for specific conductance is 700 umhos/cm.
Objective/Criterion Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at two stations:
R-A Santa Clara River approximately 300 feet upstream of point of discharge 001 to River
R-B Santa Clara River approximately 100 feet downstream of point of discharge 001 to River.
Temporal Representation: Grab samples taken and analyzed on monthly basis from June 2004 to February 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Monitoring and Reporting Program, No. CI-2960, for County Sanitation Districts of Los Angeles County, Saugus Water Reclamation Plant, (NPDES NO. CA0054313).
QAPP Information Reference(s): Monitoring and Reporting Program No. CI-2960 for County Sanitation Districts of Los Angeles County (Saugus Water Reclamation Plant) (NPDES NO. CA0054313)
 
LOE ID: 30231
 
Pollutant: Specific Conductance
LOE Subgroup: Subgroup Missing
Matrix: Water
Fraction: Total
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 21
Number of Exceedances: 12
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: The data used was the monitoring data submitted as required by the Ventura County MS4 permit (NPDES # CAS004002).
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 Agricultural Water Quality Goals published by the Food and Agriculture Organization of the United Nations for specific conductance is 700 umhos/cm.
Objective/Criterion Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were taken at the Mass Emission Santa Clara River Monitoring Station (S29). Station S29 is located near Interstate 5 about 1.5 miles west of the confluence with San Francisquito Creek (Lat 34.42660, Long -118.58649).
Temporal Representation: 21 grab samples were taken and analyzed from October 31, 2003 to April 2, 2007.
Environmental Conditions:
QAPP Information: Quality assurance information is described in the Ventura County MS4 Permit Monitoring and Reporting Program.
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: 7962
 
Pollutant: Specific Conductance
LOE Subgroup: Subgroup Missing
Matrix: Water
Fraction: Total
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 8
Number of Exceedances: 5
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Five of eight samples exceeded the Agricultural Water Quality Goals published by the Food and Agriculture Organization of the United Nations for specific conductance. Water quality samples were taken for specific conductance in accordance with regional SWAMP Monitoring parameters.
Data Reference: Surface Water Ambient Monitoring Program data for all watersheds in the Los Angeles Region 2001-2005.
 
Water Quality Objective/Criterion: The Agricultural Water Quality Goals published by the Food and Agriculture Organization of the United Nations for specific conductance is 700 umhos/cm.
Objective/Criterion Reference: Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at four SWAMP stations: 403STC019 (Lat: 34.42611, Long: -118.57915), 403STC027 (Lat: 34.54669, Long: -118.43391), 403STCBQT (Lat: 34.42809, Long: -118.54021), 403STCSFO (Lat: 34.5273, Long: -118.52908).
Temporal Representation: Grab samples were taken on 10/31/2001 at monitoring stations 403STC019, 403STCBQT, and 403STCSFO; on 02/25/2003 at monitoring stations 403STC019; on 11/13/2001 and 02/24/2003 at monitoring station 403STC027; and on 11/15/2001 and 01/13/2003 at monitoring station 403STCBQT.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and monitoring procedures detailed in State of California's Surface Water Ambient Monitoring Program Quality Assurance Management Plan.
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)