Draft California 2016 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 4 - Los Angeles Region

Water Body Name:	Santa Clara River Estuary
Water Body ID:	CAE4031100020000229171211
Water Body Type:	Estuary


DECISION ID	66590	Region 4
Santa Clara River Estuary

Pollutant:	Oxygen, Dissolved
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 Staff Conclusion:	This pollutant is being considered for placement on the CWA 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. 1 line of evidence is available in the administrative record to assess this pollutant. 223 of 1897samples exceeded the 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 CWA 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. 223 of 1897 samples exceeded the 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 Staff Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 66590, Oxygen, Dissolved	Region 4
Santa Clara River Estuary

LOE ID:

88248

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Estuarine Habitat

Number of Samples:

1897

Number of Exceedances:

223

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Numeric data generated from 1897 averages of Dissolved Oxygen concentration had 223 exceedences.

Data Reference:

Data for Various Pollutants from the city of Ventura, 1997-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

At a minimum, the mean annual dissolved oxygen concentration of all waters shall be greater than 7 mg/L, and no single determination shall be less than 5.0 mg/L, except when natural conditions cause lesser concentrations.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the following stations: 1 2 3 4 5 6 7 60 61 62 63 64 65 66 67 68 69 70 71 72 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 A-1 A-2 A-3 B-1 B-2 B-3 B-4 C-1 C-2 C-3 E-L1 E-L2 E-M1 E-M2 E-U1 E-U2 E-U3 MTS-2 MTS-2 MTS-2 (MZ-1) MTS-2 (MZ-6) MTS-3 MTS-3 (MZ-3) MTS-3 (MZ-7) MTS-R MTS-R (MZ-R) MZ-1 MZ-2 MZ-3 MZ-4 MZ-5 MZ-5b MZ-6 R2 R3 R4 R5

Temporal Representation:

Samples were collected approximately twice a month from October 1997 to May 2010.

Environmental Conditions:

QAPP Information:

The quality assurance manual for the Environmental Monitoring Division Bureau of Sanitation, Department of Public Works, City of Los Angeles was provided. Toxicity testing methods and requirements are in the NPDES permit CA0056227.

QAPP Information Reference(s):


DECISION ID	66592	Region 4
Santa Clara River Estuary

Pollutant:	Trash
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 Staff Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.7 of the Listing Policy. Under section 3.7 a single line of evidence is necessary to assess listing status. 1 line of evidence is available in the administrative record to assess this pollutant. 1 of 1 sample exceeded the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA 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. 1 of 1 sample exceeded the CRITERIA and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 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 Staff Decision 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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

Line of Evidence (LOE) for Decision ID 66592, Trash	Region 4
Santa Clara River Estuary

LOE ID:

88250

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

Not Recorded

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

The Wishtoyo Foundation's Ventura Coastkeeper removed 650 pounds of trash on 1/24/10.

Data Reference:

Data from the Ventura Coastkeeper, 2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Los Angeles RWQCB Basin Plan: Waters shall not contain floating materials, including solids, liquids, foams, and scum, in concentrations that cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Narrative objective evaluated using numeric target of zero trash in Los Angeles River Trash TMDL and other regional trash TMDLs.

Guideline Reference:

Trash Total Maximum Daily Loads for the Los Angeles River Watershed Revised Draft Staff Report. California Regional Water Quality Control Board, Los Angeles Region. July 27, 2007.

Spatial Representation:

Area covered was the Santa Clara River Estuary northwest of Harbor Blvd.

Temporal Representation:

Trash collections were performed on 1/24/10.

Environmental Conditions:

QAPP Information:

Wishtoyo Foundation volunteer monitoring QAPP was provided.

QAPP Information Reference(s):


DECISION ID	66589	Region 4
Santa Clara River Estuary

Pollutant:	Ammonia
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:	2027
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Staff Conclusion:	This pollutant is being considered for placement on the CWA 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. 1 line of evidence is available in the administrative record to assess this pollutant. 4 of 42 samples exceeded the CRITERIA. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA 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. 4 of 42 samples exceeded the CRITERIA 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 not met.

Regional Board Staff Decision 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.

Line of Evidence (LOE) for Decision ID 66589, Ammonia	Region 4
Santa Clara River Estuary

LOE ID:

88237

Pollutant:

Ammonia (Unionized)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

4 of 42 samples exceed the one-hour average concentration of 0.233 mg un-ionized NH3/L. 18 of the 42 data are reported as non-detects. These non-detects are less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.

Data Reference:

Data for Various Pollutants from the city of Ventura, 1997-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Los Angeles Region (Basin Plain): For waters in which the salinity is equal to or greater than 10 parts per thousand 95% or more of the time, the applicable objectives are a 4-day average concentration of 0.035 mg un-ionized NH3/L and a one-hour average concentration of 0.233 mg un-ionized NH3/L.

Objective/Criterion Reference:

1999 Update of Ambient Water Quality Criteria for Ammonia

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at EL1 (Lower Estuary main channel), EL2 (Lower Estuary at mouth), EM1 (Middle Estuary main channel), EM2 (Middle Estuary d/s of VWRF Outfall), EU1 (Upper Estuary main channel (d/s of Harbor Blvd. Bridge), EU2 (Upper Estuary high-flow channel), EU3 (Upper Estuary d/s of VWRF Outfall).

Temporal Representation:

Samples were collected from 9/1/2009 to 11/17/2009 and from 1/27/2010 to 7/27/2010.

Environmental Conditions:

QAPP Information:

A signed QAPP was not submitted.

QAPP Information Reference(s):


DECISION ID	66591	Region 4
Santa Clara River Estuary

Pollutant:	pH
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:	2027
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Staff Conclusion:	This pollutant is being considered for placement on the CWA 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. 1 line of evidence is available in the administrative record to assess this pollutant. 149 of 493 samples exceeded the OBJECTIVE. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA 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. 149 of 493 samples exceeded the OBJECTIVE and this exceeds 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 Staff Decision 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.

Line of Evidence (LOE) for Decision ID 66591, pH	Region 4
Santa Clara River Estuary

LOE ID:

88249

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Estuarine Habitat

Number of Samples:

493

Number of Exceedances:

149

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One hundred and forty nine of the 493 samples exceeded the objective.

Data Reference:

Data for Various Pollutants from the city of Ventura, 1997-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The pH of all inland surface waters shall not be depressed below 6.5 or raised above 8.5 as a result of waste discharges.

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Samples were collected approximately twice a month from October 1997 to May 2010.

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):


DECISION ID	34243	Region 4
Santa Clara River Estuary

Pollutant:	ChemA
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2012)
Revision Status	Revised
Sources:	Source Unknown
TMDL Name:	Santa Clara River Estuary (33)
TMDL Project Code:	379
Date TMDL Approved by USEPA:	09/21/2011
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Staff Conclusion:	303(d) listing decisions made prior to 2006 were not held in an assessment database. There is sufficient justification to place this waterbody/pollutant in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: 1. The Santa Clara River Toxaphene TMDL was approved by USEPA on 09/21/2011

Regional Board Staff Decision 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.

Line of Evidence (LOE) for Decision ID 34243, ChemA	Region 4
Santa Clara River Estuary

LOE ID:

4153

Pollutant:

ChemA

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Not Recorded

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

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 pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	35722	Region 4
Santa Clara River Estuary

Pollutant:	Indicator Bacteria
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2012)
Revision Status	Revised
Sources:	Source Unknown
TMDL Name:	Santa Clara River Coliform (23b & 34)
TMDL Project Code:	380
Date TMDL Approved by USEPA:	01/31/2012
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Staff Conclusion:	303(d) listing decisions made prior to 2006 were not held in an assessment database. There is sufficient justification to place this waterbody/pollutant in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: 1. The Santa Clara River Bacteria TMDL was approved by USEPA on 01/31/2012.

Regional Board Staff Decision 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.

Line of Evidence (LOE) for Decision ID 35722, Indicator Bacteria	Region 4
Santa Clara River Estuary

LOE ID:

4154

Pollutant:

Coliform Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

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 pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Unspecified

Guideline Reference:

Placeholder reference pre-2006 303(d)

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	35380	Region 4
Santa Clara River Estuary

Pollutant:	Nitrogen, Nitrate
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2012)
Revision Status	Revised
Sources:	Source Unknown
TMDL Name:	Santa Clara River Nitrogen (32)
TMDL Project Code:	227
Date TMDL Approved by USEPA:	03/23/2004
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Staff Conclusion:	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. 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. 56 of 288 samples exceeded the Los Angeles Region Basin Plan water quality objects for nitrate-nitrogen (NO3-N) 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. There is sufficient justification to place this waterbody/pollutant in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: 1. The Santa Clara River Nutrients TMDL was approved by USEPA on 03/23/2004.

Regional Board Staff Decision 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.

Line of Evidence (LOE) for Decision ID 35380, Nitrogen, Nitrate	Region 4
Santa Clara River Estuary

LOE ID:

7819

Pollutant:

Nitrogen, Nitrate

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Estuarine Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Wildlife Habitat

Number of Samples:

288

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

56 of 288 samples exceed Basin Plan standards. Monthly ambient water quality samples for nitrate were taken in compliance with the Ventura Water Reclamation Facility NDPES permit monitoring requirements.

Data Reference:

NPDES receiving water monitoring reports for the City of San Buenaventura Ventura Water Reclamation Facility (NPDES No. CA0053651).

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Basin Plan states that "...waters shall not exceed 10 mg/L as nitrate-nitrogen (NO3-N)..."

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The listed monitoring stations for this water body pollutant combination include: R1 located at the south shoreline, R2 located at South Shoreline, R3 located at the west shoreline, R4 located at West shoreline near the point of surface discharge or tidal inflow/outflow at shoreline, and L5 located at the northwest shoreline.

Temporal Representation:

Grab samples were taken and analyzed on monthly basis from January 2002 to February 2007

Environmental Conditions:

QAPP Information:

Data collected for compliance with Ventura Water Reclamation Facility Monitoring and Reporting Program.

QAPP Information Reference(s):

Ventura Water Reclamation Facility Monitoring and reporting program for NPDES No. CA0053651


DECISION ID	36274	Region 4
Santa Clara River Estuary

Pollutant:	Toxaphene
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2012)
Revision Status	Revised
Sources:	Source Unknown
TMDL Name:	Santa Clara River Estuary (33)
TMDL Project Code:	379
Date TMDL Approved by USEPA:	09/21/2011
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Staff Conclusion:	303(d) listing decisions made prior to 2006 were not held in an assessment database. There is sufficient justification to place this waterbody/pollutant in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: 1. The Santa Clara River Toxaphene TMDL was approved by USEPA on 09/21/2011.

Regional Board Staff Decision 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.

Line of Evidence (LOE) for Decision ID 36274, Toxaphene	Region 4
Santa Clara River Estuary

LOE ID:

4155

Pollutant:

Toxaphene

LOE Subgroup:

Pollutant-Tissue

Matrix:

Tissue

Fraction:

Not Recorded

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

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 pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Unspecified

Guideline Reference:

Placeholder reference pre-2006 303(d)

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):


DECISION ID	36060	Region 4
Santa Clara River Estuary

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2012)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Staff Conclusion:	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. Zero of one SWAMP sample exceed the CTR chronic criteria for saltwater and there are insufficient data to evaluate whether this exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Two of 63 Ventura WRF samples exceed the CTR chronic criteria for saltwater 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.

Regional Board Staff Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

Line of Evidence (LOE) for Decision ID 36060, Arsenic	Region 4
Santa Clara River Estuary

LOE ID:

7549

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Estuarine Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

Two of 63 samples exceeded the California Toxics Rule saltwater Chronic Criteria for Arsenic. Semi-annual ambient water quality samples for Arsenic were taken in compliance with the Ventura Water Reclamation Facility NDPES permit monitoring requirements.

Data Reference:

NPDES receiving water monitoring reports for the City of San Buenaventura Ventura Water Reclamation Facility (NPDES No. CA0053651).

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Toxics Rule lists a Chronic Criteria of 36 ug/L for Arsenic to protect aquatic life in saltwater.

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:

The listed monitoring stations for this water body pollutant combination include: R1 located at the south shoreline, R3 located at the west shoreline, and L5 located at the northwest shoreline.

Temporal Representation:

Grab samples were taken and analyzed on semi-annual basis from February 2002 to February 2007

Environmental Conditions:

QAPP Information:

Data collected for compliance with Ventura Water Reclamation Facility Monitoring and Reporting Program.

QAPP Information Reference(s):

Ventura Water Reclamation Facility Monitoring and reporting program for NPDES No. CA0053651

Line of Evidence (LOE) for Decision ID 36060, Arsenic	Region 4
Santa Clara River Estuary

LOE ID:

30238

Pollutant:

Arsenic

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Estuarine Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Wildlife Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

Zero of one samples exceeded the California Toxics Rule saltwater Chronic Criteria for Arsenic.

Data Reference:

Surface Water Ambient Monitoring Program data for all watersheds in the Los Angeles Region 2001-2005.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

The California Toxics Rule lists a Chronic Criteria of 36 ug/L for Arsenic to protect aquatic life in saltwater.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One monitoring station: 403STCEST.

Temporal Representation:

Grab samples taken and analyzed on 11/14/2001.

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)


DECISION ID	35422	Region 4
Santa Clara River Estuary

Pollutant:	Toxicity
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2012)
Revision Status	Original
Sources:	Source Unknown
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Staff Conclusion:	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 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 6.1.3 of the 2. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 3. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 4. 67 of 150 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. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

Regional Board Staff Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.

Line of Evidence (LOE) for Decision ID 35422, Toxicity	Region 4
Santa Clara River Estuary

LOE ID:

7834

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Estuarine Habitat

Aquatic Life Use:

Fish Migration | Fish Spawning | Preservation of Rare & Endangered Species | Wildlife Habitat

Number of Samples:

150

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

67 of 150 samples exceeded the water quality objective from the Basin Plan for the Coastal Watersheds of Los Angeles and Ventura Counties.

Data Reference:

NPDES receiving water monitoring reports for the City of San Buenaventura Ventura Water Reclamation Facility (NPDES No. CA0053651).

SWAMP Data:

Non-SWAMP

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

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:

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.

Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fourth Edition. EPA 600/4-90/27.

Spatial Representation:

The listed monitoring stations for this water body pollutant combination include: R1 located at the south shoreline, R3 located at the west shoreline, and L5 located at the northwest shoreline.

Temporal Representation:

Grab samples were taken and analyzed on semi-annual basis from January 2002 to February 2007.

Environmental Conditions:

QAPP Information:

Data collected for compliance with Ventura Water Reclamation Facility Monitoring and Reporting Program.

QAPP Information Reference(s):

Ventura Water Reclamation Facility Monitoring and reporting program for NPDES No. CA0053651