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

Supporting Information

Regional Board 4 - Los Angeles Region

Water Body Name: Calleguas Creek Reach 4 (was Revolon Slough Main Branch: Mugu Lagoon to Central Avenue on 1998 303d list)
Water Body ID: CAR4031100019990202140512
Water Body Type: River & Stream
 
DECISION ID
7544
 
Pollutant: Boron
Final Listing Decision: Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2006)
Revision Status Revised
Reason for Delisting: Other
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Historical Background (Technical Report from Larry Walker Associates, April 2007):

"In 2002, the USEPA added listings to Reach 4, Revolon Slough for boron, TDS, and sulfate. In the decision (USEPA, 2003), the USEPA stated:
'The Los Angeles Region Basin Plan does not contain specific numeric water quality standards for boron, sulfate or TDS for Calleguas Creek Reach 4 (also known as Revolon Slough Main Channel). The State's rationale for not listing-that there are no water body specific numeric standards in the Basin Plan for these pollutants-is invalid. Federal regulations at 40 CFR 130.7(b) require States to apply narrative water quality standards. The State should have applied the Basin Plan narrative standard for chemical constituents to assess these pollutants. The Basin Plan includes numeric guidelines for these pollutants that are "necessary to protect different categories of beneficial uses", including the beneficial uses designated for Calleguas Creek Reach 4 (Basin Plan, pp. 2-8 and 3-14). EPA concludes that it is appropriate to apply these numeric guidelines to evaluate potential exceedances of the narrative water quality standard for chemical constituents.'
Basically, the USEPA determined that the numeric Basin Plan objectives did not exist for Revolon Slough, but that a narrative standard applied. An interpretation of the narrative standard was used to determine exceedances, but the letter from USEPA did not provide information on the values that were used to determine the exceedances. USEPA found that the boron guidelines were exceeded in 11 of 13 samples, the TDS guideline was exceeded in 13 of 15 samples and the sulfate guideline was exceeded in 14 of 15 samples. Additional information is not available on the concentrations of the samples used in the evaluation."

Current Listing Assessment:

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 removing this water segment-pollutant combination from the section 303(d) list.

This conclusion is based on the staff findings that:
Pursuant to section 4.11 of the Listing Policy, this water segment may be delisted due to a Situation-Specific Weight of Evidence Delisting Factor as follows:
a. 39 salinity samples were taken at Revolon Slough at Peck Road during the 2003-2004 Calleguas Creek Watershed TMDL monitoring.
b. The mean salinity measured was 2.2 ppt and 28 out of 39 samples were greater than or equal to 2 ppt.
c. It is generally accepted that waters with a salinity less than 1 ppt are considered fresh, and waters with a salinity of greater than 10 ppt are considered saline.
d. The salinity measured in Revolon Slough at Wood Road appears to be slightly brackish, and may be a sign that some tidal influence may still be received at Wood Road.
e. Revolon Slough drains to Mugu Lagoon. Calleguas Creek also drains to Mugu Lagoon and is tidally influenced to Portrero Road where it has an elevation of approximately 29 feet. Revolon Slough at Wood Road has an elevation of approximately 25 feet. The corresponding 29 feet elevation mark in Revolon Slough falls just below Laguna Road.
f. The salinity sampling was performed by Larry Walker Associates under contract to the Calleguas Creek Watershed Management Plan Steering Committee with support from the California Regional Water Quality Control Board, Los Angeles Region, and the United States Environmental Protection Agency, Region 9.
g. The Basin Plan Amendment (Resolution R4-2007-016) concludes that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS."
 
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 the Basin Plan Amendment (Resolution R4-2007-016) concludes that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS."
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 7544
 
LOE ID: 21478
 
Pollutant: Boron
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: QUALITATIVE (EVALUATED) ASSESSMENT - UNSPECIFIED
Data Used to Assess Water Quality: Revolon Slough below Laguna Road is determined to be tidally influenced based on the study: "Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report" by Larry Walker Associates, April, 2007.
Data Reference: Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
 
Water Quality Objective/Criterion: The Basin Plan Amendment (Resolution R4-2007-016) states that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS." This amendment was based on the study: "Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report" by Larry Walker Associates, April, 2007.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
  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:
Temporal Representation:
Environmental Conditions:
QAPP Information: Larry Walker Associates provided the analysis to determine the TMDL for salts in the CCW under contract to the Calleguas Creek Watershed Management Plan Steering Committee with support from the California Regional Water Quality Control Board, Los Angeles Region and the United States Environmental Protection Agency, Region 9.
QAPP Information Reference(s): Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
 
LOE ID: 4048
 
Pollutant: Boron
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 pre-2006 303(d)
 
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
7546
 
Pollutant: Sulfates
Final Listing Decision: Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2006)
Revision Status Revised
Reason for Delisting: Other
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Historical Background (Technical Report from Larry Walker Associates, April 2007):

"In 2002, the USEPA added listings to Reach 4, Revolon Slough for boron, TDS, and sulfate. In the decision (USEPA, 2003), the USEPA stated:
'The Los Angeles Region Basin Plan does not contain specific numeric water quality standards for boron, sulfate or TDS for Calleguas Creek Reach 4 (also known as Revolon Slough Main Channel). The State's rationale for not listing-that there are no water body specific numeric standards in the Basin Plan for these pollutants-is invalid. Federal regulations at 40 CFR 130.7(b) require States to apply narrative water quality standards. The State should have applied the Basin Plan narrative standard for chemical constituents to assess these pollutants. The Basin Plan includes numeric guidelines for these pollutants that are "necessary to protect different categories of beneficial uses", including the beneficial uses designated for Calleguas Creek Reach 4 (Basin Plan, pp. 2-8 and 3-14). EPA concludes that it is appropriate to apply these numeric guidelines to evaluate potential exceedances of the narrative water quality standard for chemical constituents.'
Basically, the USEPA determined that the numeric Basin Plan objectives did not exist for Revolon Slough, but that a narrative standard applied. An interpretation of the narrative standard was used to determine exceedances, but the letter from USEPA did not provide information on the values that were used to determine the exceedances. USEPA found that the boron guidelines were exceeded in 11 of 13 samples, the TDS guideline was exceeded in 13 of 15 samples and the sulfate guideline was exceeded in 14 of 15 samples. Additional information is not available on the concentrations of the samples used in the evaluation."

Current Listing Assessment:

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 removing this water segment-pollutant combination from the section 303(d) list.

This conclusion is based on the staff findings that:
Pursuant to section 4.11 of the Listing Policy, this water segment may be delisted due to a Situation-Specific Weight of Evidence Delisting Factor as follows:
a. 39 salinity samples were taken at Revolon Slough at Peck Road during the 2003-2004 Calleguas Creek Watershed TMDL monitoring.
b. The mean salinity measured was 2.2 ppt and 28 out of 39 samples were greater than or equal to 2 ppt.
c. It is generally accepted that waters with a salinity less than 1 ppt are considered fresh, and waters with a salinity of greater than 10 ppt are considered saline.
d. The salinity measured in Revolon Slough at Wood Road appears to be slightly brackish, and may be a sign that some tidal influence may still be received at Wood Road.
e. Revolon Slough drains to Mugu Lagoon. Calleguas Creek also drains to Mugu Lagoon and is tidally influenced to Portrero Road where it has an elevation of approximately 29 feet. Revolon Slough at Wood Road has an elevation of approximately 25 feet. The corresponding 29 feet elevation mark in Revolon Slough falls just below Laguna Road.
f. The salinity sampling was performed by Larry Walker Associates under contract to the Calleguas Creek Watershed Management Plan Steering Committee with support from the California Regional Water Quality Control Board, Los Angeles Region, and the United States Environmental Protection Agency, Region 9.
g. The Basin Plan Amendment (Resolution R4-2007-016) concludes that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS."
 
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 the Basin Plan Amendment (Resolution R4-2007-016) concludes that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS."
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 7546
 
LOE ID: 21477
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: QUALITATIVE (EVALUATED) ASSESSMENT - UNSPECIFIED
Data Used to Assess Water Quality: Revolon Slough below Laguna Road is determined to be tidally influenced based on the study: "Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report" by Larry Walker Associates, April, 2007.
Data Reference: Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
 
Water Quality Objective/Criterion: The Basin Plan Amendment (Resolution R4-2007-016) states that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS." This amendment was based on the study: "Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report" by Larry Walker Associates, April, 2007.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
  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:
Temporal Representation:
Environmental Conditions:
QAPP Information: Larry Walker Associates provided the analysis to determine the TMDL for salts in the CCW under contract to the Calleguas Creek Watershed Management Plan Steering Committee with support from the California Regional Water Quality Control Board, Los Angeles Region and the United States Environmental Protection Agency, Region 9.
QAPP Information Reference(s): Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
 
LOE ID: 4049
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Not Recorded
 
Beneficial Use: Municipal & Domestic 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 pre-2006 303(d)
 
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
7548
 
Pollutant: Total Dissolved Solids
Final Listing Decision: Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2006)
Revision Status Revised
Reason for Delisting: Other
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.

Historical Background (Technical Report from Larry Walker Associates, April 2007):

"In 2002, the USEPA added listings to Reach 4, Revolon Slough for boron, TDS, and sulfate. In the decision (USEPA, 2003), the USEPA stated:
'The Los Angeles Region Basin Plan does not contain specific numeric water quality standards for boron, sulfate or TDS for Calleguas Creek Reach 4 (also known as Revolon Slough Main Channel). The State's rationale for not listing-that there are no water body specific numeric standards in the Basin Plan for these pollutants-is invalid. Federal regulations at 40 CFR 130.7(b) require States to apply narrative water quality standards. The State should have applied the Basin Plan narrative standard for chemical constituents to assess these pollutants. The Basin Plan includes numeric guidelines for these pollutants that are "necessary to protect different categories of beneficial uses", including the beneficial uses designated for Calleguas Creek Reach 4 (Basin Plan, pp. 2-8 and 3-14). EPA concludes that it is appropriate to apply these numeric guidelines to evaluate potential exceedances of the narrative water quality standard for chemical constituents.'
Basically, the USEPA determined that the numeric Basin Plan objectives did not exist for Revolon Slough, but that a narrative standard applied. An interpretation of the narrative standard was used to determine exceedances, but the letter from USEPA did not provide information on the values that were used to determine the exceedances. USEPA found that the boron guidelines were exceeded in 11 of 13 samples, the TDS guideline was exceeded in 13 of 15 samples and the sulfate guideline was exceeded in 14 of 15 samples. Additional information is not available on the concentrations of the samples used in the evaluation."

Current Listing Assessment:

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 removing this water segment-pollutant combination from the section 303(d) list.

This conclusion is based on the staff findings that:
Pursuant to section 4.11 of the Listing Policy, this water segment may be delisted due to a Situation-Specific Weight of Evidence Delisting Factor as follows:
a. 39 salinity samples were taken at Revolon Slough at Peck Road during the 2003-2004 Calleguas Creek Watershed TMDL monitoring.
b. The mean salinity measured was 2.2 ppt and 28 out of 39 samples were greater than or equal to 2 ppt.
c. It is generally accepted that waters with a salinity less than 1 ppt are considered fresh, and waters with a salinity of greater than 10 ppt are considered saline.
d. The salinity measured in Revolon Slough at Wood Road appears to be slightly brackish, and may be a sign that some tidal influence may still be received at Wood Road.
e. Revolon Slough drains to Mugu Lagoon. Calleguas Creek also drains to Mugu Lagoon and is tidally influenced to Portrero Road where it has an elevation of approximately 29 feet. Revolon Slough at Wood Road has an elevation of approximately 25 feet. The corresponding 29 feet elevation mark in Revolon Slough falls just below Laguna Road.
f. The salinity sampling was performed by Larry Walker Associates under contract to the Calleguas Creek Watershed Management Plan Steering Committee with support from the California Regional Water Quality Control Board, Los Angeles Region, and the United States Environmental Protection Agency, Region 9.
g. The Basin Plan Amendment (Resolution R4-2007-016) concludes that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS."
 
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 the Basin Plan Amendment (Resolution R4-2007-016) concludes that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS."
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 7548
 
LOE ID: 21473
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Agricultural Supply
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: QUALITATIVE (EVALUATED) ASSESSMENT - UNSPECIFIED
Data Used to Assess Water Quality: Revolon Slough below Laguna Road is determined to be tidally influenced based on the study: "Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report" by Larry Walker Associates, April, 2007.
Data Reference: Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
 
Water Quality Objective/Criterion: The Basin Plan Amendment (Resolution R4-2007-016) states that: "The segment of Reach 4 below Laguna Road is tidally influenced and therefore not impaired for chloride, boron, sulfate, and TDS." This amendment was based on the study: "Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report" by Larry Walker Associates, April, 2007.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
  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:
Temporal Representation:
Environmental Conditions:
QAPP Information: Larry Walker Associates provided the analysis to determine the TMDL for salts in the CCW under contract to the Calleguas Creek Watershed Management Plan Steering Committee with support from the California Regional Water Quality Control Board, Los Angeles Region and the United States Environmental Protection Agency, Region 9.
QAPP Information Reference(s): Calleguas Creek Watershed Boron, Chloride, TDS, and Sulfate TMDL Public Review Technical Report
 
LOE ID: 4050
 
Pollutant: Total Dissolved Solids
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 pre-2006 303(d)
 
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
5509
 
Pollutant: DDT (tissue & sediment)
Final Listing Decision: Do Not Delist from 303(d) list (being addressed with 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
Sources: Agriculture-storm runoff | Atmospheric Deposition | Irrigated Crop Production | Nonpoint Source | Source Unknown | Urban Runoff/Storm Sewers
TMDL Name: Calleguas Creek Historic Pesticides (AU #5)
TMDL Project Code: 358
Date TMDL Approved by USEPA: 01/01/2005
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for removal on the section 303(d) list under sections 2.2 and 4.1 of the Listing Policy. Under section 4.1 of the Policy, a minimum of one line of evidence is needed 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 against removing this water segment-pollutant combination from the section 303(d) list and placing it in the Being Addressed portion of the 303(d) because a TMDL has been completed and approved by RWQCB and USEPA and is expected to result in attainment of the standards.

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. 3 of 3 samples exceeded the NAS fish tissue guidance for DDT and these exceed the allowable frequency listed in Table 4.1 of the Listing Policy.
4. 3 of 4 samples exceeded the California Toxics Rule Criterion Continuous Concentration for DDT for the protection of freshwater aquatic life and these exceed the allowable frequency listed in Table 4.1 of the Listing Policy.
5. The Total Maximum Daily Load for Toxicity, Chlorpyrifos, and Diazinon in Calleguas Creek, Its Tributaries, and Mugu Lagoon was approved by the Region Board in 2005 and approved by USEPA on November 27, 2005.
6. 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 removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded and be placed in the Water Quality Limited Segments Being Addressed category of the section 303(d) list because a TMDL has been approved.
 
SWRCB Board Decision / Staff Recommendation: After review of the available information for this recommendation, SWRCB staff conclude that the water body pollutant combination should be placed in the Water Quality Limited Segments Being Addressed category of the section 303(d) list because a TMDL has been approved.
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5509
 
LOE ID: 2014
 
Pollutant: DDT
LOE Subgroup: Pollutant-Tissue
Matrix: Tissue
Fraction: Total
 
Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms
 
Number of Samples: 3
Number of Exceedances: 3
 
Data and Information Type: Fish tissue analysis
Data Used to Assess Water Quality: Three out of 3 samples exceeded (note: Fillet sample of goldfish exceeded OEHHA screening value in 1992). A total of 3 whole fish composite samples of flathead minnow were collected. Flathead minnow samples were collected in 1993-94 and 1997. The guideline was exceeded in all samples (TSMP, 2002).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: Los Angeles RWQCB Basin Plan: Toxic pollutants shall not be present at levels that will bioaccumulate in aquatic life to levels which are harmful to aquatic life or human health.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline: 1000 ng/g NAS Guideline (whole fish)
Guideline Reference: Placeholder reference 2006 303(d)
 
Spatial Representation: One station located below concrete apron just downstream of Woods Road.
Temporal Representation: Samples were collected annually from 1993-94 and 1997.
Environmental Conditions:
QAPP Information: Toxic Substances Monitoring Program 1992-93 and 1994-95 Data Reports.
Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program,1996-2000. Department of Fish and Game
QAPP Information Reference(s):
 
LOE ID: 21461
 
Pollutant: DDT
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: 4
Number of Exceedances: 3
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Three of four samples exceeded the California Toxics Rule Citerion Continuous Concentration for DDT. Water quality samples were taken and analyzed for DDT in accordance with Los Angeles Municipal Separate Storm Sewer System 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 a freshwater Criterion Continuous Concentration of 0.001 ug/L for DDT for the protection of aquatic life.
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 Ventura County Watershed Protection District sampled and measured DDT at the receiving monitoring station W-4 in Revolon Slough at Wood Road.
Temporal Representation: Four composite samples were taken in February 2003 2004, and October 2004 and 2005.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and monitoring procedures detailed in NPDES Permit No. No. CAS004001 Monitoring and Reporting Program.
QAPP Information Reference(s): Monitoring and Reporting Program - CI 6948 for order no. 01-182 NPDES No. CAS004001 Municipal Storm Water and Urban Runoff Discharges within the County of Los Angeles, and the incorporated cities, except the City of Long Beach
 
DECISION ID
6977
 
Pollutant: Trash
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)(2006)
Revision Status Revised
Sources: Agriculture-storm runoff | Recreational and Tourism Activities (non-boating) | Urban Runoff/Storm Sewers
TMDL Name: Calleguas Creek (Beardsley/Revolon) Trash
TMDL Project Code: 720
Date TMDL Approved by USEPA: 02/27/2008
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for removal on the section 303(d) list under sections 2.2 of the Listing Policy. Under 2.2 of the Policy, a minimum of one line of evidence is needed 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 against removing this water segment-pollutant combination from the section 303(d) list. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and adopted by the Los Angeles RWQCB and approved by USEPA, and is expected to result in attainment of the standard.
 
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 Water Quality Limited Segments Being Addressed category of the section 303(d) list because a TMDL has been approved by USEPA, and 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 6977
 
LOE ID: 4051
 
Pollutant: Trash
LOE Subgroup: Visual
Matrix: Not Specified
Fraction: Not Recorded
 
Beneficial Use: Non-Contact Recreation
 
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 pre-2006 303(d)
 
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):
 
LOE ID: 28045
 
Pollutant: Trash
LOE Subgroup: Narrative Description Data
Matrix: Not Specified
Fraction: None
 
Beneficial Use: Non-Contact Recreation
 
Number of Samples: 0
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: A TMDL has been approved for this water segment-pollutant combination. The Revolon Slough & Beardsley Wash Trash TMDL was adopted by the Los Angeles RWQCB on June 07, 2007 and subsequently approved by USEPA. The TMDL was integrated into the Basin Plan as Attachment A of Regional Board Resolution No. 2007-007.
Data Reference: Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
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QAPP Information: QA information unavailable.
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