Water Body Name: | Wilmington Drain |
Water Body ID: | CAR4051200020020307110435 |
Water Body Type: | River & Stream |
DECISION ID |
150492 |
Region 4 |
Wilmington Drain |
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Pollutant: | Ammonia |
Final Listing Decision: | Delist from 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Delist from 303(d) list (TMDL required list)(2018) |
Revision Status | Revised |
Reason for Delisting: | Applicable WQS attained; reason for recovery unspecified |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | 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. Two line of evidence is available in the administrative record to assess this pollutant. Line of evidence (LOE) 4278 will not be considered for this decision because it is a placeholder LOE. The original data was not able to be assessed using current standards due to lack of temperature and pH data. 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 29 and 0 of 7 samples exceeded the objective for ammonia and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
Regional Board Decision 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board. |
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LOE ID: | 251915 | ||||
Pollutant: | Nitrogen, ammonia (Total Ammonia) | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 7 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Ammonia as N. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The USEPA Health Advisory for lifetime exposure to ammonia as a drinking water level is a concentration of 30 mg/L. This Advisory Level is defined as 'the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for up to ten days of exposure. | ||||
Guideline Reference: | 2018 Edition of the Drinking Water Standards and Health Advisories | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2019-04-20 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
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LOE ID: | 4278 | ||||
Pollutant: | Ammonia | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
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: | 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): | |||||
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LOE ID: | 27904 | ||||
Pollutant: | Ammonia | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Aquatic Life Use: | Preservation of Rare & Endangered Species | Wetland Habitat | Wildlife Habitat | ||||
Number of Samples: | 29 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | One of 29 samples exceeded the 30-day average objective for ammonia. The sample value for the exceedance was 0.63 mg/L and the 30 day average objective based on temperature and pH was 0.44 mg/L.
The pH data used ranged from 7.5 - 9.0. The temperature data used ranged from 9.0 - 23.0 C. There were 29 pH and temperature data points corresponding to 29 ammonia samples analyzed. Water quality samples were taken and analyzed for ammonia in as part of the City of Los Angeles Watershed Protection Division's Machado Lake Nutrients Monitoring Program. |
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Data Reference: | Water quality monitoring for Wilmington Drain at Lomita Blvd. | ||||
SWAMP Data: | Non-SWAMP | ||||
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 formula 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 | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The City of Los Angeles Watershed Protection Division conducted sampling in Wilmington Drain at the water quality monitoring station near Lomita Boulevard. | ||||
Temporal Representation: | Grab samples were taken and analyzed on a biweekly basis from October 2007 to June 2008. | ||||
Environmental Conditions: | |||||
QAPP Information: | Data was collected in accordance with the City of Los Angeles Pollution Assessment Section's Standard Operating Procedures for monitoring and testing. | ||||
QAPP Information Reference(s): | Quality Assurance Manual Prepared for The Analysts, Supervisors, and Managers of the Environmental Monitoring Division, Bureau of Sanitation, Department of Public Works, City of Los Angeles | ||||
DECISION ID |
138075 |
Region 4 |
Wilmington Drain |
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Pollutant: | Lead |
Final Listing Decision: | Delist from 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Delist from 303(d) list (TMDL required list)(2018) |
Revision Status | Revised |
Reason for Delisting: | Applicable WQS attained; reason for recovery unspecified |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. 4 lines of evidence are available in the administrative record to assess this pollutant. 0 of the 33 samples exceeded the CRITERIA. 0 of the 1 samples exceeded the CRITERIA. 0 of the 1 samples exceeded the CRITERIA. 0 of the 0 samples exceeded the CRITERIA. 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 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. 0 of 33, 0 of 1, 0 of 1 and 0 of 0 samples exceeded the CRITERIA and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
Regional Board Decision Recommendation: | 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
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LOE ID: | 252447 | ||||
Pollutant: | Lead | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Lead. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for lead is 15 ug/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
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LOE ID: | 252689 | ||||
Pollutant: | Lead | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Lead. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved lead criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.5 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
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LOE ID: | 4281 | ||||
Pollutant: | Lead | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
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: | 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): | |||||
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LOE ID: | 90134 | ||||
Pollutant: | Lead | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 33 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | None of the 33 samples exceeded the hardness adjusted CTR value for dissolved lead. | ||||
Data Reference: | Letter with enclosures from the City of Los Angeles, Bureau of Sanitation, Watershed Protection Division and Regulatory Affairs Division regarding several listed water bodies in the Los Angeles River watershed and Dominguez Channel watershed | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved lead to protect aquatic life in freshwater. The lead criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a hardness of 100 mg/L was used. | ||||
Guideline Reference: | Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition | ||||
Spatial Representation: | Samples were collected from Wilmington Drain at Lomita Ave. which is located at approximately, 33° 47' 52.01" N / 118° 17' 21.04" W. | ||||
Temporal Representation: | Samples were collected on weekly from October to December 2007, then either monthly or twice a month from January 2008 until February 2009. | ||||
Environmental Conditions: | There were no specific environmental conditions reported during sampling events. | ||||
QAPP Information: | The Quality Assurance Plan provided with these data, "Quality Assurance Manual prepared for the City of Los Angeles' Environmental Monitoring Division, Bureau of Sanitation, Department of Public Works" was dated and signed on December 2009 which is after the data submitted was collected and analyzed. The quality of these data can not be assessed. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
150346 |
Region 4 |
Wilmington Drain |
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Pollutant: | Indicator Bacteria |
Final Listing Decision: | Do Not Delist from 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2018) |
Revision Status | Revised |
Sources: | A Source Unknown |
Expected TMDL Completion Date: | 2007 |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for removal from the CWA 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. 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 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. 13 of 14 samples exceeded the statistical threshold value for E. coli and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
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LOE ID: | 303002 | ||||
Pollutant: | Escherichia coli (E. coli) | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | STV | ||||
Beneficial Use: | Water Contact Recreation | ||||
Number of Samples: | 14 | ||||
Number of Exceedances: | 13 | ||||
Data and Information Type: | PATHOGEN MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and the results are as follows: 13 of the 14 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The bacteria water quality objective to protect the REC-1 beneficial use where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018). | ||||
Objective/Criterion Reference: | Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site(s), station(s): WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the days of 2016-07-28 and 2019-11-28 . | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
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LOE ID: | 4279 | ||||
Pollutant: | Coliform Bacteria | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Water 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) | ||||
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 |
138085 |
Region 4 |
Wilmington Drain |
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Pollutant: | Alkalinity as CaCO3 |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
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LOE ID: | 251846 | ||||
Pollutant: | Alkalinity as CaCO3 | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). | ||||
Guideline Reference: | National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138065 |
Region 4 |
Wilmington Drain |
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Pollutant: | Antimony |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
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LOE ID: | 251997 | ||||
Pollutant: | Antimony | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Antimony. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for antimony is 0.006 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
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LOE ID: | 251999 | ||||
Pollutant: | Antimony | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Antimony. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for antimony is 0.006 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
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LOE ID: | 251719 | ||||
Pollutant: | Antimony | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Antimony. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986) | ||||
Guideline Reference: | Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001. | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 251768 | ||||
Pollutant: | Antimony | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Antimony. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The USEPA Quality Criteria for Water (Gold Book) states that for antimony toxicity to algae occurs at 610 ug/l. (USEPA, 1986) | ||||
Guideline Reference: | Quality Criteria for Water 1986. United States Environmental Protection Agency. Office of Water. Regulations and Standards. Washington D.C. EPA 440/5-86-001. | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138066 |
Region 4 |
Wilmington Drain |
||
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)(2018) |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 251811 | ||||
Pollutant: | Arsenic | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 90470 | ||||
Pollutant: | Arsenic | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 5 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | None of the five samples tested for disolved arsenic exceeded the numeric criteria of 150 ug/L promulgated to protect warm freshwater habitat. | ||||
Data Reference: | Data for various pollutants in Compton Creek, Oct. 2006-Dec. 2009. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | California Toxics Rule lists criterion continuous concentrations (expresesed as a 4-day average) for dissolved arsenic to protect aquatic life in freshwater. The numeric criteria for arsenic 150 ug/L. | ||||
Guideline Reference: | Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition | ||||
Spatial Representation: | Sampling station W3 is approximately located at Cressy Street Drain--Williamington Drain. | ||||
Temporal Representation: | Samples were collected on 8/10/2006, 10/26/2006, 3/8/2007, 10/15/2008, and 10/13/2009. | ||||
Environmental Conditions: | |||||
QAPP Information: | Heal the Bays, "Compton Creek Monitoring Program" description provided with data submitted. This monitoring program is part of the Citys Total Maximum Daily Load ambient monitoring efforts to monitor inputs to the Los Angeles River. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 251848 | ||||
Pollutant: | Arsenic | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for arsenic is 10 ug/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 251833 | ||||
Pollutant: | Arsenic | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Arsenic. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for arsenic is 10 ug/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138067 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Cadmium |
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)(2018) |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 251837 | ||||
Pollutant: | Cadmium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for cadmium is 0.005 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 90471 | ||||
Pollutant: | Cadmium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 3 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | None of the samples tested for cadmium exceeded the numeric criteria promulgated to protect warm freshwater habitat. | ||||
Data Reference: | Data for various pollutants in Compton Creek, Oct. 2006-Dec. 2009. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | California Toxics Rule (CTR) lists criterion continuous concentrations for cadmium to protect aquatic life in freshwater. The cadmium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. | ||||
Guideline Reference: | Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition | ||||
Spatial Representation: | Sampling station W3 is approximately located at Cressy Street Drain--Williamington Drain. | ||||
Temporal Representation: | Samples were collected on 8/10/2006, 10/26/2006, and 10/13/1009. | ||||
Environmental Conditions: | |||||
QAPP Information: | Heal the Bays, "Compton Creek Monitoring Program" description provided with data submitted. This monitoring program is part of the Citys Total Maximum Daily Load ambient monitoring efforts to monitor inputs to the Los Angeles River. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 251795 | ||||
Pollutant: | Cadmium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138068 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Chlordane |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Chlordane in sediment: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List. 1 lines of evidence are available in the administrative record to assess this pollutant. 2 of the 2 samples exceed the evaluation guideline for chlordane in sediment, and there are no lines of evidence associated with sediment toxicity. Based on the readily available data and information, the weight of evidence indicates that there is or insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List for chlordane in sediment 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. 2 of the 2 samples exceed the evaluation guideline for chlordane in sediment and this sample size is sufficient or determine beneficial use support, with the power and confidence of the Listing Policy. However, there is not an associated sediment toxicity data as required by Section 3.6 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. Chlordane in water: Two lines of evidence are available to assess this pollutant. 1 out of 1 sample exceed the criterion for Municipal & Domestic Supply, and 0 out of 1 sample exceeds the criterion for Warm Freshwater Habitat. This information is insufficient to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 252704 | ||||
Pollutant: | Chlordane | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Total Chlordane. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2018-04-17 and 2018-04-17 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 253190 | ||||
Pollutant: | Chlordane | ||||
LOE Subgroup: | Pollutant-Sediment | ||||
Matrix: | Sediment | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 2 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and the results are as follows: 2 of the 2 samples exceeded the evaluation guideline for Chlordane . | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no increase in pesticide concentrations found in bottom sediments or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The evaluation guideline for chlordane is the probable effect concentration (PEC) of 17.6 ug/kg dry weight (MacDonald et al., 2000a). | ||||
Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
Spatial Representation: | Data were collected from 1 station(s). Station Code(s): WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | Data for this waterbody were collected over the date range 2018-04-17 to 2019-04-18 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 253036 | ||||
Pollutant: | Chlordane | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Total Chlordane. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2018-04-17 and 2018-04-17 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138069 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Chloride |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 251988 | ||||
Pollutant: | Chloride | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Chloride. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Secondary Maximum Contaminant Level (SMCL) recommended level for chloride is 250 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 251707 | ||||
Pollutant: | Chloride | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Chloride. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The chloride criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 230000 ug/L (230 mg/L)(USEPA National Recommended Water Quality Criteria, 2006). | ||||
Guideline Reference: | National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138086 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Chromium |
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)(2018) |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 251906 | ||||
Pollutant: | Chromium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for total chromium is 0.05 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 90472 | ||||
Pollutant: | Chromium, trivalent | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 5 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | None of five samples tested for dissolved chromium exceeded the numeric criteria promulgated to protect warm freshwater habitat. | ||||
Data Reference: | Data for various pollutants in Compton Creek, Oct. 2006-Dec. 2009. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved trivalent chromium to protect aquatic life in freshwater. The trivalent chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. | ||||
Guideline Reference: | Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition | ||||
Spatial Representation: | Sampling station W3 is approximately located at Cressy Street Drain--Williamington Drain. | ||||
Temporal Representation: | Samples were collected on 8/10/2006, 10/26/2006, 3/8/2007, 10/15/2008, and 10/13/2009. | ||||
Environmental Conditions: | |||||
QAPP Information: | Heal the Bays, "Compton Creek Monitoring Program" description provided with data submitted. This monitoring program is part of the Citys Total Maximum Daily Load ambient monitoring efforts to monitor inputs to the Los Angeles River. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 251863 | ||||
Pollutant: | Chromium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chromium. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved chromium (III) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is is hardness dependent as described in Table 1 of paragraph (b)(1). The value calculated when using a default hardness of 100 mg/L is 180 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
150040 |
Region 4 |
Wilmington Drain |
||
Pollutant: | DDD (Dichlorodiphenyldichloroethane) |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 253242 | ||||
Pollutant: | DDD (Dichlorodiphenyldichloroethane) | ||||
LOE Subgroup: | Pollutant-Sediment | ||||
Matrix: | Sediment | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDD (Dichlorodiphenyldichloroethane) . | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no increase in pesticide concentrations found in bottom sediments or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The evaluation guideline for the sum of DDD is the probable effect concentration (PEC) of 28 ug/kg dry weight (MacDonald et al., 2000a). | ||||
Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
Spatial Representation: | Data were collected from 1 station(s). Station Code(s): WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | Data for this waterbody were collected over the date range 2018-04-17 to 2018-04-17 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
150041 |
Region 4 |
Wilmington Drain |
||
Pollutant: | DDE (Dichlorodiphenyldichloroethylene) |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 253243 | ||||
Pollutant: | DDE (Dichlorodiphenyldichloroethylene) | ||||
LOE Subgroup: | Pollutant-Sediment | ||||
Matrix: | Sediment | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for DDE (Dichlorodiphenyldichloroethylene) . | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no increase in pesticide concentrations found in bottom sediments or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The evaluation guideline for the sum of DDE is the probable effect concentration (PEC) of 31.3 ug/kg dry weight (MacDonald et al., 2000a). | ||||
Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
Spatial Representation: | Data were collected from 1 station(s). Station Code(s): WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | Data for this waterbody were collected over the date range 2018-04-17 to 2019-04-18 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
150042 |
Region 4 |
Wilmington Drain |
||
Pollutant: | DDT (Dichlorodiphenyltrichloroethane) |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 253245 | ||||
Pollutant: | DDT (Dichlorodiphenyltrichloroethane) | ||||
LOE Subgroup: | Pollutant-Sediment | ||||
Matrix: | Sediment | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDT (Dichlorodiphenyltrichloroethane) . | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no increase in pesticide concentrations found in bottom sediments or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The evaluation guideline for the sum of DDT is the probable effect concentration (PEC) of 62.9 ug/kg dry weight (MacDonald et al., 2000a). | ||||
Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
Spatial Representation: | Data were collected from 1 station(s). Station Code(s): WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | Data for this waterbody were collected over the date range 2018-04-17 to 2018-04-17 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 253219 | ||||
Pollutant: | Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) | ||||
LOE Subgroup: | Pollutant-Sediment | ||||
Matrix: | Sediment | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) . | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no increase in pesticide concentrations found in bottom sediments or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The evaluation guideline for total DDTs is the probable effect concentration (PEC) of 572 ug/kg dry weight (MacDonald et al., 2000a). | ||||
Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
Spatial Representation: | Data were collected from 1 station(s). Station Code(s): WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | Data for this waterbody were collected over the date range 2018-04-17 to 2019-04-18 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138071 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Dieldrin |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 253252 | ||||
Pollutant: | Dieldrin | ||||
LOE Subgroup: | Pollutant-Sediment | ||||
Matrix: | Sediment | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Dieldrin . | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. There shall be no increase in pesticide concentrations found in bottom sediments or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The evaluation guideline for dieldrin is the probable effect concentration (PEC) of 61.8 ug/kg dry weight (MacDonald et al., 2000a). | ||||
Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
Spatial Representation: | Data were collected from 1 station(s). Station Code(s): WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | Data for this waterbody were collected over the date range 2018-04-17 to 2018-04-17 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138072 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Fluoride |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 252065 | ||||
Pollutant: | Fluoride | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Fluoride. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for fluoride is 2 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138073 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Glyphosate |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 252136 | ||||
Pollutant: | Glyphosate | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Glyphosate. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Water designated for use as domestic or municipal supply (MUN) shall not contain concentrations of pesticides in excess of the maximum contaminant levels specified in California Code of Regulations, Title 22, able 64444-A of section 64444 (Organic Chemicals) which is incorporated by reference into this plan. The MUN beneficial use objective of Region 4 Basin Plan is 700 ug/L. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252090 | ||||
Pollutant: | Glyphosate | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Glyphosate. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The evaluation guideline for glyphosate is the USEPA Aquatic Life Benchmark of 11,900 ug/L for a vascular plant (acute). | ||||
Guideline Reference: | OPP Aquatic Life Benchmarks | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138076 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Malathion |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 252548 | ||||
Pollutant: | Malathion | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Malathion. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | Aquatic life should not be affected unacceptably if the 4-day average concentration of malathion does not exceed 0.028 ug/L (UC Davis Aquatic Life Criteria). | ||||
Guideline Reference: | Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48. | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252506 | ||||
Pollutant: | Malathion | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Malathion. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The USEPA drinking water health advisory for lifetime exposure to malathion is 500 ug/L. | ||||
Guideline Reference: | 2018 Edition of the Drinking Water Standards and Health Advisories | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138077 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Nickel |
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)(2018) |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 252584 | ||||
Pollutant: | Nickel | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nickel. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The maximum contaminant level of nickel in public water systems shall be 0.1 mg/L (California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 90157 | ||||
Pollutant: | Nickel | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 5 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | None of the samples tested for dissolved nickel exceeded the numeric criteria promulgated to protect warm freshwater habitat. | ||||
Data Reference: | Data for various pollutants in Compton Creek, Oct. 2006-Dec. 2009. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | California Toxics Rule (CTR) lists criterion continuous concentrations (expressed as a 4-day average concentration) for dissolved nickel to protect aquatic life in freshwater. The nickel criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a hardness of 100 mg/L was used. | ||||
Guideline Reference: | Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition | ||||
Spatial Representation: | Sampling station W3 is approximately located at Cressy Street Drain--Williamington Drain. | ||||
Temporal Representation: | Samples were collected on 8/10/2006, 10/26/2006, 3/8/2007, 10/15/2008, and 10/13/2009. | ||||
Environmental Conditions: | |||||
QAPP Information: | Heal the Bays, "Compton Creek Monitoring Program" description provided with data submitted. This monitoring program is part of the Citys Total Maximum Daily Load ambient monitoring efforts to monitor inputs to the Los Angeles River. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 252666 | ||||
Pollutant: | Nickel | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252600 | ||||
Pollutant: | Nickel | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved nickel criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 52 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252627 | ||||
Pollutant: | Nickel | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nickel. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The maximum contaminant level of nickel in public water systems shall be 0.1 mg/L (California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138078 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Nitrate/Nitrite (Nitrite + Nitrate as N) |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 252384 | ||||
Pollutant: | Nitrate/Nitrite (Nitrite + Nitrate as N) | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 15 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Nitrate + Nitrite as N. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for nitrate + nitrite (as N) is 10 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2019-11-27 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 302512 | ||||
Pollutant: | Nitrate/Nitrite (Nitrite + Nitrate as N) | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 15 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Nitrate + Nitrite as N. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region (page 3-34) states that: Waters shall not exceed 10 mg/L nitrogen as nitrate-nitrogen plus nitrite-nitrogen (NO3-N + NO2-N). | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2019-11-27 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
150044 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Nitrogen, Nitrate |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 302485 | ||||
Pollutant: | Nitrogen, Nitrate | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 9 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Nitrate as N. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region (page 3-34) 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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2019-11-27 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252401 | ||||
Pollutant: | Nitrogen, Nitrate | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 9 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Nitrate as N. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for nitrate (as N) 10 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2019-11-27 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
150045 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Nitrogen, Nitrite |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 252404 | ||||
Pollutant: | Nitrogen, Nitrite | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Nitrite as N. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for nitrite (as N) is 1.0 mg/L (Title 22 of the California Code of Regulations). | ||||
Guideline Reference: | Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2017-09-20 and 2018-02-20 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138080 |
Region 4 |
Wilmington Drain |
||
Pollutant: | PCBs (Polychlorinated biphenyls) |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 253174 | ||||
Pollutant: | PCBs (Polychlorinated biphenyls) | ||||
LOE Subgroup: | Pollutant-Sediment | ||||
Matrix: | Sediment | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 3 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls) . | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The evaluation guideline for total PCBs is the probable effect concentration (PEC) of 676 ug/kg dry weight (MacDonald et al., 2000a). | ||||
Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
Spatial Representation: | Data were collected from 1 station(s). Station Code(s): WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | Data for this waterbody were collected over the date range 2017-06-20 to 2019-04-18 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138079 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Perchlorate |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 252742 | ||||
Pollutant: | Perchlorate | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Perchlorate. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for perchlorate is 0.006 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138081 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Selenium |
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)(2018) |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board 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 are necessary to assess listing status. 1 line of evidence is available in the administrative record to assess this pollutant. 0 of 5 samples 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 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. 0 of 5 samples 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 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 252909 | ||||
Pollutant: | Selenium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252825 | ||||
Pollutant: | Selenium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for selenium is 0.05 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252886 | ||||
Pollutant: | Selenium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Maximum Contaminant Level for selenium is 0.05 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252955 | ||||
Pollutant: | Selenium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The selenium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 5 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 90158 | ||||
Pollutant: | Selenium | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Total | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 5 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | None of five samples tested for total selenium exceeded the recommended criteria of 5 ug/L. | ||||
Data Reference: | Data for various pollutants in Compton Creek, Oct. 2006-Dec. 2009. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | National Recommended Water Quality Criteria Continuous Concentrations are intended protect freshwater aquatic organisms from chronic exposures and are expressed as 4-day average concentrations. The recommended criteria for selenium is 5 ug/L. | ||||
Guideline Reference: | National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology | ||||
Spatial Representation: | Sampling station W3 is approximately located at Cressy Street Drain--Williamington Drain. | ||||
Temporal Representation: | Samples were collected on 8/10/2006, 10/26/2006, 3/8/2007, 10/15/2008, and 10/13/2009. | ||||
Environmental Conditions: | |||||
QAPP Information: | Heal the Bays, "Compton Creek Monitoring Program" description provided with data submitted. This monitoring program is part of the Citys Total Maximum Daily Load ambient monitoring efforts to monitor inputs to the Los Angeles River. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
151912 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Surfactants (MBAS) |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 307908 | ||||
Pollutant: | Surfactants (MBAS) | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for MBAS. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region (page 3-33) states that: Waters shall not have MBAS concentrations greater than 0.5 mg/L in waters designated MUN. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138082 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Total Dissolved Solids |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 252723 | ||||
Pollutant: | Total Dissolved Solids | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Total Dissolved Solids. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Secondary Maximum Contaminant Level recommended level for total dissolved solids (TDS) is 500 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138083 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Turbidity |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This 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, and five exceedances are necessary to list. Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 252875 | ||||
Pollutant: | Turbidity | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 2 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Turbidity. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Secondary Maximum Contaminant Level for turbidity is 5 NTU (California Code of Regulations, Title 22). Calculation of a numeric objective for other beneficial uses requires comparison with upstream or other background data which may not be available as part of the data used for water quality assessment. | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252832 | ||||
Pollutant: | Turbidity | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Turbidity. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | Turbidities of 40 NTU or greater can cause a reduced foraging efficiency and a shift in prey selection in piscivorous fish (largemouth bass) due to interference with their ability to find prey (Shoup, D.E. and Wahl D.H., 2009). | ||||
Guideline Reference: | The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138084 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Zinc |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
|||||
LOE ID: | 252944 | ||||
Pollutant: | Zinc | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved zinc criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 120 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252947 | ||||
Pollutant: | Zinc | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Zinc. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Secondary Maximum Contaminant Level for zinc is 5.0 mg/L (California Code of Regulations, Title 22). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-07-28 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138087 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Aluminum |
Final Listing Decision: | 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)(2018) |
Revision Status | Revised |
Sources: | A Source Unknown |
Expected TMDL Completion Date: | 2037 |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | During the 2024 cycle, the 1988 National Recommended Water Quality Criteria used to assess aluminum data was replaced with U.S. EPA’s 2018 Final Recommended Aquatic Life Criteria for Aluminum in Freshwater. 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. Two lines of evidence are available in the administrative record to assess this pollutant. LOE 90469 was found to be inaccurate when reassessed using the updated 2018 USEPA aluminum criterion, and was retired. 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. Two of 2 samples exceed 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 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 251914 | ||||
Pollutant: | Aluminum | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 2 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Aluminum. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Secondary Maximum Contaminant Level (SCML) for aluminum is 0.2 mg/L (Title 22 California Code of Regulations). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
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LOE ID: | 314824 | ||||
Pollutant: | Aluminum | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Aluminum. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate. | ||||
Guideline Reference: | Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA. | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138070 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Copper |
Final Listing Decision: | List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Delist from 303(d) list (TMDL required list)(2018) |
Revision Status | Revised |
Sources: | A Source Unknown |
Expected TMDL Completion Date: | 2037 |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board 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. 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. 0 of 5, 6 of 38, 0 of 1 and 1 of 1 samples exceed 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 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 252212 | ||||
Pollutant: | Copper | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 5 | ||||
Number of Exceedances: | 4 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 4 of 5 samples exceeded the water quality threshold for Copper. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2018-02-20 and 2019-11-27 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252148 | ||||
Pollutant: | Copper | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 5 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The copper criterion for the protection of human health from the consumption of water and organisms is 1,300 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2018-02-20 and 2019-11-27 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 252215 | ||||
Pollutant: | Copper | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Copper. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 90131 | ||||
Pollutant: | Copper | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 33 | ||||
Number of Exceedances: | 2 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | Two of the 33 samples exceeded the hardness adjusted CTR value for dissolved lead. | ||||
Data Reference: | Letter with enclosures from the City of Los Angeles, Bureau of Sanitation, Watershed Protection Division and Regulatory Affairs Division regarding several listed water bodies in the Los Angeles River watershed and Dominguez Channel watershed | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved copper to protect aquatic life in freshwater. The lead criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. If no hardness data were available, a hardness of 100 mg/L was used. | ||||
Guideline Reference: | Code of Federal Regulations 40 part 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. 7/1/2011 Edition | ||||
Spatial Representation: | Samples were collected from Wilmington Drain at Lomita Ave. which is located at approximately, 33° 47' 52.01" N / 118° 17' 21.04" W. | ||||
Temporal Representation: | Samples were collected on weekly from October to December 2007, then either monthly or twice a month from January 2008 until February 2009. | ||||
Environmental Conditions: | There were no specific environmental conditions reported during sampling events. | ||||
QAPP Information: | The Quality Assurance Plan provided with these data, "Quality Assurance Manual prepared for the City of Los Angeles' Environmental Monitoring Division, Bureau of Sanitation, Department of Public Works" was dated and signed on December 2009 which is after the data submitted was collected and analyzed. The quality of these data can not be assessed. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 4280 | ||||
Pollutant: | Copper | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
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: | 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): | |||||
|
|||||
LOE ID: | 252213 | ||||
Pollutant: | Copper | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 1 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The copper criterion for the protection of human health from the consumption of water and organisms is 1,300 ug/L (California Toxics Rule, 2000). | ||||
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 samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-11-21 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
DECISION ID |
138074 |
Region 4 |
Wilmington Drain |
||
Pollutant: | Iron |
Final Listing Decision: | 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)(2018) |
Revision Status | Revised |
Sources: | A Source Unknown |
Expected TMDL Completion Date: | 2037 |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board 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 are necessary to assess listing status. 3 lines of evidence are available in the administrative record to assess this pollutant. 2 of 2 samples exceeded the CRITERIA. 1 of 2 samples exceeded the CRITERIA. 1 of 5 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 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. 1 of 5, 1 of 2, and 2 of 2 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 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. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
|
|||||
LOE ID: | 252024 | ||||
Pollutant: | Iron | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 1 of 2 samples exceeded the water quality threshold for Iron. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | National Recommended Water Quality Criteria Continuous Concentrations are intended protect freshwater aquatic organisms from chronic exposures and are expressed as 4-day average concentrations. The evaluation guideline for Iron is 1,000 ug/L. | ||||
Guideline Reference: | National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016. | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||
|
|||||
LOE ID: | 90132 | ||||
Pollutant: | Iron | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Total | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 5 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
Data Used to Assess Water Quality: | One of the five samples tested for total iron exceeded the recommended numeric criteria of 1,000 ug/L to protect warm freshwater habitat. | ||||
Data Reference: | Data for various pollutants in Compton Creek, Oct. 2006-Dec. 2009. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | National Recommended Water Quality Criteria Continuous Concentrations are intended protect freshwater aquatic organisms from chronic exposures and are expressed as 4-day average concentrations. The recommended numeric criteria for iron is 1,000 ug/L. | ||||
Guideline Reference: | National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology | ||||
Spatial Representation: | Sampling station W3 is approximately located at Cressy Street Drain--Williamington Drain. | ||||
Temporal Representation: | Samples were collected on 8/10/2006, 10/26/2006, 3/8/2007, 10/15/2008, and 10/13/2009. | ||||
Environmental Conditions: | |||||
QAPP Information: | Heal the Bays, "Compton Creek Monitoring Program" description provided with data submitted. This monitoring program is part of the Citys Total Maximum Daily Load ambient monitoring efforts to monitor inputs to the Los Angeles River. Dissolved concentrations do not exceed the narrative objective. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 252465 | ||||
Pollutant: | Iron | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 2 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed LA County MS4 data for Wilmington Drain to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Iron. | ||||
Data Reference: | WQ data from the MS4 database assembled for the 2024 Integrated Report in Region 4. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The Water Quality Control Plan for the Los Angeles Region states that: Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use. | ||||
Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
Evaluation Guideline: | The California Secondary Maximum Contaminant Level for iron is 0.3 mg/L (Title 22 California Code of Regulations). | ||||
Guideline Reference: | California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water | ||||
Spatial Representation: | The samples were collected at 1 monitoring site: WD-01 (Wilmington Drain at PCH). | ||||
Temporal Representation: | The samples were collected between the dates of 2016-07-28 and 2016-11-21 | ||||
Environmental Conditions: | |||||
QAPP Information: | Municipal Separate Storm Sewer System (MS4) | ||||
QAPP Information Reference(s): | Municipal Separate Storm Sewer System (MS4) | ||||